Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
uncomplainingly is an adverb meaning "without complaining". It carries one recorded sense.
without complaining
“an equally gallant little wife and mother uncomplainingly keeping up the production of tasty and nourishing meals”
Definitions, synonyms and semantic relations for uncomplainingly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .