Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unseeable is an adjective meaning "impossible or nearly impossible to see; imperceptible by the eye". It carries one recorded sense.
impossible or nearly impossible to see; imperceptible by the eye
“the invisible man”
“invisible rays”
“an invisible hinge”
“invisible mending”
Definitions, synonyms and semantic relations for unseeable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.