Synonyms of preposterousness

2 Syllables
unthrift, daftness, folly, follies
3 Syllables
idiocy, psychosis, dottiness, witlessness, foolishness, psychoses, nonsense
4 Syllables
insanities, insanity, insaneness, psychopathy, senselessness, absurdity, wastefulness, profligacy, unwiseness, stupidity
5 Syllables
prodigality, ridiculousness, extravagance, imbecility
7 Syllables
inadvisability, irresponsibility