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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.
thoughtlessly is an adverb meaning "in a thoughtless manner". It carries 2 recorded senses.
in a thoughtless manner
“he stared thoughtlessly at the picture”
Definitions, synonyms and semantic relations for thoughtlessly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.