Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unforgivingly is an adverb meaning "without forgiveness; in an unforgiving manner". It carries one recorded sense.
without forgiveness; in an unforgiving manner
“unforgivingly, he insisted that she pay her debt to the last penny”
Definitions, synonyms and semantic relations for unforgivingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .