Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
scatterbrained is an adjective meaning "lacking sense or discretion". It carries 2 recorded senses.
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 scatterbrained come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.