Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unthreatening is an adjective meaning "not unfriendly or threatening". It carries one recorded sense.
not unfriendly or threatening
“her well-meaning words were received in silence”
“the exasperation of a...well-meaning cow worried by dogs”
Definitions, synonyms and semantic relations for unthreatening come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.