feather-brained

adj (derog 贬) foolish; silly 愚蠢的; 没头脑的.

FCO, FD, fealty, fear, fear for, fearful, fearfully, fearfulness, fearless, fearlessly, fearlessness, fearsome, feasibility, feasible, feasibly, feast, feat, feather, feather bed, feather-bed, featherweight, feathery, feature, featureless, Feb, febrile, February, fecal, feces, feckless, fecklessly, fecklessness, fecund, fecundity, Fed, fed up, federal, federate, federation, fee,