Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unappeasable is an adjective meaning "not to be placated or appeased or moved by entreaty". It carries one recorded sense.
not to be placated or appeased or moved by entreaty
“grim determination”
“grim necessity”
“Russia's final hour, it seemed, approached with inexorable certainty”
“relentless persecution”
“the stern demands of parenthood”
Definitions, synonyms and semantic relations for unappeasable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.