Synonyms of absurdness

1 Syllable
prank
2 Syllables
mischief, antics
3 Syllables
poppycock, foolishness, craziness, carrying-on, tommyrot, nonsense, horseplay, lunacy, foolery, silliness
4 Syllables
insanity, buffoonery, hanky-panky, inanity, hokey-pokey, senselessness, ludicrousness, misbehavior, mischief-making, monkeyshine, absurdity, unwiseness, stupidity
5 Syllables
disobedience, imbecility
7 Syllables
irresponsibility