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WORDNET DICTIONARY

Adjective rattlebrained has 1 sense

• rattlebrained(s = adj.all) rattlepated, scatterbrained, scatty - lacking sense or discretion; "his rattlebrained crackpot ideas"; "how rattlepated I am! I've forgotten what I came for"

THESAURUS

rattlebrained

blank, brainless, dizzy, empty, empty-headed, empty-minded, empty-pated, empty-skulled, featherbrained, featherheaded, flighty, fluttery, frivolous, gaga, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, harebrain, harebrained, hollow, inane, jejune, rattleheaded, rattlepated, scatterbrained, scramblebrained, shatterbrained, silly, skittish, thoughtless, vacant, vacuous, vapid, witless

For further exploring for "rattlebrained" in Webster Dictionary Online