Synonyms of silliness

1 Syllable
bs
2 Syllables
twaddle, daftness, folly, humbug, piffle, follies
3 Syllables
poppycock, fatuousness, lunacies, battiness, pettiness, dottiness, wackiness, nuttiness, flakiness, goofiness, foolishness, craziness, absurdness, carrying-on, tommyrot, brainlessness, doltishness, nonsense, lunacy, shallowness, foolery, flapdoodle
4 Syllables
pettinesses, tomfoolery, puerility, nitwittedness, thick-headedness, weak-mindedness, inaneness, inanity, absurdities, hokey-pokey, senselessness, rigmarole, mischief-making, hoity-toity, stupidities, absurdity, obtuseness, unwiseness, thickheadedness, stupidity
5 Syllables
asininity, ineptitude, feeble-mindedness, injudiciousness, feeblemindedness, imbecility
6 Syllables
nonsensicality
7 Syllables
inadvisability