'rattlebrained' definitions:

Definition of 'rattlebrained'

From: WordNet
adjective
Lacking sense or discretion; "his rattlebrained crackpot ideas"; "how rattlepated I am! I've forgotten what I came for"- Glenway Westcott [syn: rattlebrained, rattlepated, scatterbrained, scatty]

Synonyms of 'rattlebrained'

From: Moby Thesaurus