irrationality /ɪˌɹæʃ.əˈnæl.ə.ti/ noun5 •The quality or state of being irrational. •The state of being illogical or absurd. •Something that is irrational; the result of an illogical or absurd thought or action. •The state of being incapable of reason or abstract thought. •The property of being an irrational number. formsirrationalities