the state or quality of being irrational irrational thought, action, or behaviour
WordReference Random House Unabridged Dictionary of American English © 2025
ir•ra•tion•al•ism
(i rash′ə nl iz′əm),USA pronunciation n.
ir•ra′tion•al•ist, adj., n.
ir•ra′tion•al•is′tic, adj.
WordReference Random House Unabridged Dictionary of American English © 2025- irrationality in thought or action.
- an attitude or belief having a nonrational basis.
- a theory that nonrational forces govern the universe.
- irrational + -ism 1805–15
ir•ra′tion•al•is′tic, adj.
ir•ra•tion•al•i•ty
(i rash′ə nal′i tē),USA pronunciation n., pl. -ties for 2.
- the quality or condition of being irrational.
- an irrational, illogical, or absurd action, thought, etc.
- irrational + -ity 1560–70
Collins Concise English Dictionary © HarperCollins Publishers::
'irrationalism' also found in these entries (note: many are not synonyms or translations):