Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
untiring is an adjective meaning "characterized by hard work and perseverance". It carries one recorded sense.
characterized by hard work and perseverance
Definitions, synonyms and semantic relations for untiring come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.