27 irrational synonyms include unreasonable, illogical, groundless, baseless, unfounded, unjustifiable, unsound, absurd, ridiculous, and ludicrous. Irrational is an adjective, and its antonyms are rational and logical. Here are some additional synonyms for "irrational" with example sentences.
27 other ways to say irrational.
His fear of harmless insects is completely irrational.
It's irrational to panic over something so small.
She made an irrational decision in the heat of the moment.
The argument was based on irrational beliefs.