Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
softheaded is an adjective meaning "foolish; totally unsound". It carries one recorded sense.
foolish; totally unsound
“a crazy scheme”
“half-baked ideas”
“a screwball proposal without a prayer of working”
colloquialism
Definitions, synonyms and semantic relations for softheaded come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.