silly - noun

a word used for misbehaving children

silly - adjective

• ludicrous, foolish
• lacking seriousness; given to frivolity
• inspiring scornful pity
• dazed from or as if from repeated blows

silly - thesaurus

airheaded   cockamamie   cockamamy   dizzy   featherbrained   giddy   goofy   lightheaded   pathetic   ridiculous   sappy   slaphappy   wacky   whacky   zany