irrationality irrationalistic • irrationalize · · · Info · Definitions · Synonyms · Characters · · irrationality · · Text Latin · · Script 13 · · Length Definitions · · · (noun) the state of being irrational; lacking powers of understanding. Synonyms: unreason. · · Noun Definition 1 Synonyms · · · unreason · · Synonym 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079