Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
inalterable is an adjective meaning "not capable of being changed or altered". It carries one recorded sense.
not capable of being changed or altered
“unalterable resolve”
“an unalterable ground rule”
Definitions, synonyms and semantic relations for inalterable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.