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Definitions

arbitrary

[ahr-bi-trer-ee] / ˈɑr bɪˌtrɛr i /
ADJECTIVE
whimsical, chance
Synonyms
STRONGEST
capricious discretionary erratic frivolous inconsistent irrational irresponsible random subjective unreasonable willful
WEAK
approximate fanciful injudicious offhand optional supercilious superficial unaccountable unscientific wayward
Antonyms
STRONGEST
consistent definite dependable logical reasonable regular reliable sensible steady unchanging
WEAK
circumspect democratic rational reasoned supported
ADJECTIVE
dictatorial
Synonyms
STRONGEST
autocratic
WEAK
absolute bossy despotic dogmatic domineering downright flat out high-handed imperious magisterial monocratic no ifs ands or buts no joke overbearing peremptory straight out summary tyrannical tyrannous
Antonyms
WEAK
circumspect democratic rational reasonable reasoned supported

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“It’s an arbitrary threshold that serves a few purposes.”

From MarketWatch • Apr. 10, 2026

The A cap seems arbitrary and shifting to A-minuses feels inconsequential, he said.

From The Wall Street Journal • Apr. 3, 2026

That’s a quintessential example of an agency action that’s unlawfully arbitrary and capricious.

From Slate • Mar. 27, 2026

Brendan O'Hara, vice chair of the all-parliamentary group for arbitrary detention and hostage affairs, previously told the BBC the Foremans were "innocent victims of a geopolitical power struggle".

From BBC • Mar. 26, 2026

At first it seems arbitrary, then I see a pattern, like an intricate maze, appearing in the moonlight on Beetee’s side.

From "Catching Fire" by Suzanne Collins

Vocabulary lists containing arbitrary

The Vocabulary.com Top 1000

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100 SAT Words Beginning with "A"

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The Declaration of Independence

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!