Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ill-considered is an adjective meaning "not given careful consideration". It carries one recorded sense.
not given careful consideration
“ill-considered actions often result in disaster”
“an ill-judged attempt”
Definitions, synonyms and semantic relations for ill-considered come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.