Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
heartlessly is an adverb meaning "in a heartless manner". It carries one recorded sense.
in a heartless manner
“she behaves rather heartlessly toward her admirers”
Definitions, synonyms and semantic relations for heartlessly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
147,478 entries in AltF Lexicon, 83,117 of them with their syllables marked.
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