Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unbiassed is an adjective meaning "characterized by a lack of partiality". It carries 2 recorded senses.
characterized by a lack of partiality
“a properly indifferent jury”
“an unbiased account of her family problems”
without bias
Definitions, synonyms and semantic relations for unbiassed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.