Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
restfully is an adverb meaning "in a restful manner". It carries one recorded sense.
in a restful manner
“the streets are restfully sunny and still for the town is at mass”
Definitions, synonyms and semantic relations for restfully come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .