Added 9 October 2026 unalterable adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about unalterable at Wordnik → Where our words come from → Not capable of being changed or altered. unalterable resolve Of a sentence; that cannot be changed. an unalterable death sentence Remaining the same for indefinitely long times. Related Words: inalterableincurableunchangeableincommutablechangelesslastfinalinviolableimmutableunchangedintangibleunchanging Back to today's word