Find Antonyms

arbitrary Antonyms

Opposite of arbitrary

Because the opposite of arbitrary shifts with each meaning, the 17 antonyms and opposite words below are separated across 3 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Based on random choice or personal whim, rather than any reason, logic, or system.

Usage Example

"The committee's decision to set the deadline at noon on a Tuesday seemed completely rational."

Strongest
rational
systematic
logical
reasoned
Strong
methodical
consistent
objective

• adjective (Context 2)

Unrestrained and autocratic in the use of authority (of power or a ruling body).

Usage Example

"The constitution was designed to protect citizens from constitutional arrest and abuse of state power."

Strongest
constitutional
democratic
accountable
Strong
lawful
equitable
just

• adjective (Context 3)

Of unspecified value or nature; variable and not assigned a fixed value (in mathematics and logic).

Usage Example

"To prove the theorem, let us first consider an fixed positive integer."

Strongest
fixed
constant
specific
Strong
definite

Similar words to arbitrary

Words similar to arbitrary shift depending on context. Common synonyms include:

capricious
autocratic
random
despotic
unspecified
tyrannical
dictatorial
whimsical
See all synonyms of arbitrary

• Nearby Words

arbiter
arbitrarily
arbitrariness
arbitrary
arbitrate
arbitration
arbitrator

Cite this Entry

Wordmom. (2026). Antonyms for Arbitrary. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/arbitrary
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