Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
kind-heartedness is a noun meaning "sympathy arising from a kind heart". It carries one recorded sense.
sympathy arising from a kind heart
Definitions, synonyms and semantic relations for kind-heartedness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.