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