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WORDNET DICTIONARY

Adjective featherbrained has 1 sense

• featherbrained(s = adj.all) airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly - lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles"

CIDE DICTIONARY

THESAURUS

featherbrained

birdbrained, birdwitted, brainless, capricious, dizzy, empty-headed, featherheaded, fickle, flighty, fluffy, fluttery, frivolous, frothy, gaga, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, harebrain, harebrained, impulsive, light, rattlebrained, rattleheaded, rattlepated, scatterbrained, scramblebrained, shallow, shallow-headed, shallow-minded, shallow-pated, shallow-witted, shatterbrained, silly, skittish, superficial, thoughtless, unprofound, volatile, whimsical, witless

For further exploring for "featherbrained" in Webster Dictionary Online