adjective
1.
Synonyms: simple 3, asinine, fatuous, foolish, nitwitted, sheepheaded, unwitty, weak-headed, weak-minded, witless
Related Word: empty, empty-headed, vacuous; irrational, unreasonable; ignorant, unintelligent, unwise
Antonyms: sensible
2.
Synonyms: giddy 1, bird-witted, dizzy, empty-headed, featherbrained, flighty, harebrained, light-headed, rattlebrained, scatterbrained
Related Word: ||balmy, crazy, ||dippy, irrational, off, ||wacked-out
Idioms: silly as a goose
Contrasted words: level-headed, practical, rational, serious
Antonyms: sensible
3.
Synonyms: foolish 2, absurd, crazy, fantastic, harebrained, insane, loony, preposterous, sappy, wacky
Related Word: funny, senseless