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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rattlebrained is an adjective meaning "lacking sense or discretion". It carries one recorded sense.
lacking sense or discretion
“his rattlebrained crackpot ideas”
“how rattlepated I am! I've forgotten what I came for”
Definitions, synonyms and semantic relations for rattlebrained come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.