Synonyms for

Unreasonable

Verb / ʌˈnri:znʌbʌl / Another word for unreasonable — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

not guided by reason; irrational

Synonyms & similar words

reasonable excessive inordinate undue illogical irrational absurd unjustifiable unfounded preposterous ridiculous senseless unthinkable unwarranted groundless baseless unproven unsupported unsubstantiated unjustified unreasonable unsound invalid untenable

Synonyms by register

Formal

inadvisable illogical unwarranted unjustified

Informal

crazy nuts outrageous ridiculous

Literary

inordinate extravagant absurd

Antonyms

reasonable rational logical sensible justifiable moderate fair

Common collocations

  • unreasonable demand
  • unreasonable price
  • unreasonable behavior
  • unreasonable request
  • unreasonable amount
  • unreasonable expectations
  • unreasonable delay

Word family

noun unreasonableness
adverb unreasonably

Usage note

Often used to describe demands, prices, or behavior that are considered excessive or unfair. Can sometimes be used hyperbolically in informal contexts.

Example sentences

  1. It is unreasonable to expect a cat to bark.
  2. It is unreasonable to stay up all night and expect to be able to concentrate the next day.
  3. It is unreasonable to expect someone to pay you back if you never lent them any money.
  4. It is unreasonable to expect to win the lottery every time you play.
  5. It is unreasonable to think that the earth is flat.

Quotes

  • 'The unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.' - George Bernard Shaw
  • 'When one has weighed the sun in the balance, and measured the steps of the moon, and mapped out the seven heavens, there still remains oneself. Who can calculate the orbit of his own soul?' - Oscar Wilde
  • 'The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.' - George Bernard Shaw

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