- rattlebrained
- adjrattlepated, addlepated, scatterbrained, giddy, Inf. slaphappy, unstable, unsteady, volatile, Sl. flaky, fickle; foolish, silly, inane, eccentric, Sl. balmy, Brit. Sl. barmy; frivolous, flighty, bird-brained; fuzzy, vague, out in left field, out of it, with one's head in the clouds, preoccupied, Sl. goofy, Sl. wacky; muzzy, confused, flustered, muddled, addled, bewildered, at sea.
A Note on the Style of the synonym finder. 2014.