Synonyms of irrationality

1 Syllable
bs, hooey
2 Syllables
daftness, folly, madness, follies
3 Syllables
psychosis, witlessness, dottiness, foolishness, psychoses, tommyrot, nonsense, flapdoodle
4 Syllables
insanities, insanity, insaneness, psychopathy, superstition, absurdities, senselessness, absurdity, superstitions, unwiseness
5 Syllables
illogicalness, imbecility, arbitrariness
6 Syllables
impracticality, illogicality, unreasonableness, illogicalities, nonsensicality
7 Syllables
inadvisability, irresponsibility