Adjectives That Start With O

169 words Words by letter Checked 9 Oct 2026

These adjectives that start with O come from a standard English dictionary used for word games, ranked by how often each word is used in everyday writing. There are 169 adjectives starting with O on this page. The 100 most common come first, each with a short meaning, followed by shorter, longer and easier picks and a filter for any ending or length.

O provides 169 adjectives, and many describe position, like outer, outside, outdoor and opposite. Odd, old and ordinary are short and easy for young readers.

Optimistic and outstanding are great words for praise in reports and cards. Organic, optical and oral connect to science and the body. Several words start with out-, which shows how this prefix often means beyond or outside. Olive is both a colour and a fruit, a nice example of a word doing double duty.

Adjectives starting with O: 169
Most used: one
Longest common one: organizational 14 letters

Most common adjectives that start with O

Ranked by how often the word appears in English text. "Type" is the word's main part of speech.

#	Word	Meaning	Type
1	one	used of a single unit or thing; not two or more	adj.
2	out	not allowed to continue to bat or run	adj.
3	other	not the same one or ones already mentioned or implied; - the White Queen	adj.
4	old	(used especially of persons) having lived for a relatively long time or attained a specific age	adj.
5	own	belonging to or on behalf of a specified person (especially yourself); preceded by a possessive	adj.
6	outside	relating to or being on or near the outer side or limit	adj.
7	original	preceding all others in time or being as first made or performed	adj.
8	okay	being satisfactory or in satisfactory condition	adj.
9	older	advanced in years; (`aged' is pronounced as two syllables)	adj.
10	overall	involving only main features	adj.
11	obvious	easily perceived by the senses or grasped by the mind	adj.
12	opposite	being directly across from each other; facing; - Longfellow	adj.
13	outstanding	distinguished from others in excellence	adj.
14	offensive	violating or tending to violate or offend against	adj.
15	odd	not divisible by two	adj.
16	ordinary	not exceptional in any way especially in quality or ability or size or degree	adj.
17	organic	relating or belonging to the class of chemical compounds having a carbon basis	adj.
18	ongoing	currently happening	adj.
19	oral	using speech rather than writing	adj.
20	outer	being on the outside or further from a center	adj.
21	outdoor	located, suited for, or taking place in the open air	adj.
22	operational	pertaining to a process or series of actions for achieving a result	adj.
23	occasional	occurring from time to time	adj.
24	olive	of a yellow-green color similar to that of an unripe olive	adj.
25	optical	of or relating to or involving light or optics	adj.
26	oval	rounded like an egg	adj.
27	optimal	most desirable possible under a restriction expressed or implied	adj.
28	orthodox	adhering to what is commonly accepted	adj.
29	optional	possible but not necessary; left to personal choice	adj.
30	optimistic	expecting the best in this best of all possible worlds	adj.
31	operative	being in force or having or exerting force	adj.
32	organizational	of or relating to an organization	adj.
33	outrageous	grossly offensive to decency or morality; causing horror	adj.
34	overweight	usually describes a large person who is fat but has a large frame to carry it	adj.
35	oriental	denoting or characteristic of countries of Asia	adj.
36	occupational	of or relating to the activity or business for which you are trained	adj.
37	obese	excessively fat	adj.
38	outdated	old; no longer valid or fashionable	adj.
39	obsolete	no longer in use	adj.
40	optic	of or relating to or resembling the eye	adj.
41	orbital	of or relating to an orbit	adj.
42	optimum	most desirable possible under a restriction expressed or implied	adj.
43	outward	relating to physical reality rather than with thoughts or the mind	adj.
44	overdue	past due; not paid at the scheduled time	adj.
45	onstage	situated or taking place on the area of a stage visible to the audience	adj.
46	obscene	designed to incite to indecency or lust; -Margaret Mead	adj.
47	ovarian	of or involving the ovaries	adj.
48	oppressive	weighing heavily on the senses or spirit	adj.
49	orderly	devoid of violence or disruption	adj.
50	ominous	threatening or foreshadowing evil or tragic developments	adj.
51	oversized	larger than normal for its kind	adj.
52	obligatory	morally or legally constraining or binding	adj.
53	oceanic	relating to or occurring or living in or frequenting the open ocean	adj.
54	obnoxious	causing disapproval or protest	adj.
55	opaque	not transmitting or reflecting light or radiant energy; impenetrable to sight	adj.
56	oily	containing an unusual amount of grease or oil	adj.
57	outspoken	given to expressing yourself freely or insistently	adj.
58	oblivious	(followed by `to' or `of') lacking conscious awareness of	adj.
59	overt	open and observable; not secret or hidden	adj.
60	orchestral	relating to or composed for an orchestra	adj.
61	overland	traveling or passing over land	adj.
62	oblique	slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled	adj.
63	obedient	dutifully complying with the commands or instructions of those in authority; ; ; ; - Edmund Burke	adj.
64	ornate	marked by elaborate rhetoric and elaborated with decorative details; ; -John Milton	adj.
65	observational	relying on observation or experiment	adj.
66	observable	capable of being seen or noticed	adj.
67	orthopedic	of or relating to orthopedics	adj.
68	objectionable	causing disapproval or protest	adj.
69	obtainable	capable of being obtained	adj.
70	oncoming	moving toward one	adj.
71	opportunistic	taking immediate advantage, often unethically, of any circumstance of possible benefit	adj.
72	outlandish	conspicuously or grossly unconventional or unusual	adj.
73	outlying	relatively far from a center or middle	adj.
74	oxidative	taking place in the presence of oxygen	adj.
75	observant	paying close attention especially to details	adj.
76	obtuse	of an angle; between 90 and 180 degrees	adj.
77	olfactory	of or relating to olfaction	adj.
78	outbound	that is going out or leaving	adj.
79	onshore	(of winds) coming from the sea toward the land	adj.
80	orthogonal	not pertinent to the matter under consideration	adj.
81	obstructive	preventing movement	adj.
82	ocular	of or relating to or resembling the eye	adj.
83	orthopaedic	of or relating to orthopedics	adj.
84	oblong	(of a leaf shape) having a somewhat elongated form with approximately parallel sides	adj.
85	operatic	of or relating to or characteristic of opera	adj.
86	onerous	not easily borne; wearing	adj.
87	opulent	rich and superior in quality	adj.
88	outstretched	fully extended especially in length	adj.
89	opinionated	obstinate in your opinions	adj.
90	omnipotent	having unlimited power	adj.
91	olden	long past	adj.
92	otherworldly	existing outside of or not in accordance with nature; -Aldous Huxley	adj.
93	overblown	puffed up with vanity; ; ; ; - Newsweek	adj.
94	omnipresent	being present everywhere at once	adj.
95	onside	not offside; being within the prescribed area of play	adj.
96	odious	unequivocally detestable; ; ; ; - Edmund Burke	adj.
97	offbeat	informal terms; strikingly unconventional	adj.
98	opportune	suitable or at a time that is suitable or advantageous especially for a particular purpose	adj.
99	obstinate	tenaciously unwilling or marked by tenacious unwillingness to yield	adj.
100	ontological	of or relating to ontology	adj.

Positive adjectives that start with O

outstanding
optimal
optimistic
orderly
obtainable
opulent

Short adjectives that start with O

one
out
other
old
own
okay
older
odd
oral
outer
olive
oval
obese
optic
oily
overt
olden
ovate
octal
oaken
ohmic
outre
otic

Long adjectives that start with O

outstanding
operational
occasional
optimistic
organizational
outrageous
overweight
occupational
oppressive
obligatory
orchestral
observational
observable
orthopedic
objectionable
obtainable
opportunistic
outlandish
orthogonal
obstructive
orthopaedic
outstretched
opinionated
omnipotent
otherworldly
omnipresent
ontological
omniscient
overzealous
ophthalmic

Filter all 169 adjectives that start with O

Narrow the full list by ending, letters inside and length. The list updates as you type.

Ends with Contains Length Sort

Questions people ask

How many adjectives start with O?

This list has 169 adjectives starting with O, taken from a standard word-game dictionary and limited to words that appear in real English text.

What are the most common adjectives that start with O?

one, out, other, old, own, outside, original, okay are the most used in everyday English.

What are some long adjectives that start with O?

outstanding, offensive, operational, occasional, optimistic.

What are easy adjectives that start with O for kids?

one, out, other, old, own, okay are short, everyday examples.

Source: the ENABLE word list (a public-domain dictionary used for word games), ranked by how often each word appears in English text (the open wordfreq project), with short meanings from Princeton WordNet. Offensive words are left out.

See every letter on one page: adjectives A to Z