Synonyms of irrational

irrational

adjective

i-ˈra-sh(ə-)nəl 

as in unreasonable

not using or following good reasoning

it's irrational to think that you can continue to consume an excess of calories and not gain weight

Synonyms & Similar Words

• unreasonable
• unreasoning
• illegitimate
• unreasoned
• illogical
• misleading
• absurd
• weak
• foolish
• nonrational
• silly
• fallacious
• invalid
• weird
• inconsequential
• meaningless
• unsound
• inconsequent
• unusual
• inconsistent
• strange
• odd
• sophistical
• misguided
• specious
• insane
• sophistic
• nonsensical
• random
• asinine
• unconsidered
• surreal
• mad
• inexplicable
• preposterous
• ill-advised
• eristic
• eristical
• disordered
• disorganized
• unexplainable
• nutty
• unaccountable
• reasonless
• whacky
• senseless
• unconvincing
• wacky
• half-baked
• Kafkaesque
• peculiar
• rambling

Antonyms & Near Antonyms

• rational
• reasonable
• logical
• valid
• sound
• sensible
• wise
• sane
• justified
• sober
• reasoned
• well-founded
• enlightened
• informed
• just
• well-grounded
• certain
• plausible
• commonsense
• compelling
• clear
• persuasive
• solid
• organized
• convincing
• credible
• true
• sure
• satisfying
• cogent
• ordered
• demonstrated
• confirmed
• established
• validated
• substantiated
• corroborated

Example Sentences

Recent Examples of irrational

Along with the other symptoms of a hangover, such as regret and embarrassment, anxiety can drive feelings of irrational worry, panic, or fear. —Mark Gurarie, Verywell Health, 19 Mar. 2025

Are irrational fears about your partner getting in the way of your relational happiness? —Mark Travers, Forbes, 7 Mar. 2025

The best of the bunch was a cold open that saw Ferrell’s Bush describing his reasonings behind bombing Iraq, a choice many deemed irrational, but were forced to get behind due to the temperature of the country and Bush’s popularity. —Harrison Richlin, IndieWire, 15 Feb. 2025

Many voters said Governor Whitmer’s order, which restricted an outdoor activity – gardening – seemed irrational and excessive, even at the time. —Jacob Turcotte, The Christian Science Monitor, 11 Mar. 2025