Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
overhasty is an adjective meaning "done with very great haste and without due deliberation". It carries one recorded sense.
done with very great haste and without due deliberation
“hasty marriage seldom proveth well”
“hasty makeshifts take the place of planning”
“rejected what was regarded as an overhasty plan for reconversion”
“wondered whether they had been rather precipitate in deposing the king”
Definitions, synonyms and semantic relations for overhasty come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.