"silliest" in the adjective sense
1. goofy, silly, wacky, whacky, zany
ludicrous, foolish
"wore a goofy hat"
"a silly idea"
"some wacky plan for selling more books"
2. airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
lacking seriousness given to frivolity
"a dizzy blonde"
"light-headed teenagers"
"silly giggles"
3. pathetic, ridiculous, silly
inspiring scornful pity
"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"- Dashiell Hammett
4. punch-drunk, silly, slaphappy
dazed from or as if from repeated blows
"knocked silly by the impact"
"slaphappy with exhaustion"
"punch-drunk with love"
Source: WordNet® (An amazing lexical database of English)
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