Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unperceivable is an adjective meaning "impossible or difficult to perceive by the mind or senses". It carries one recorded sense.
impossible or difficult to perceive by the mind or senses
“an imperceptible drop in temperature”
“an imperceptible nod”
“color is unperceivable to the touch”
Definitions, synonyms and semantic relations for unperceivable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.