| Adj. | 1. | unalterable - not capable of being changed or altered; "unalterable resolve"; "an unalterable ground rule" Synonyms: inalterable Antonyms: alterable - capable of being changed or altered in some characteristic; "alterable clothing"; "alterable conditions of employment" |
| 2. | unalterable - of a sentence; that cannot be changed; "an unalterable death sentence" | |
| 3. | unalterable - remaining the same for indefinitely long times Synonyms: changeless |