Synonyms:
unalterable, inalterable
Meaning: not capable of being changed or altered; "unalterable resolve"; "an unalterable ground rule"
Usage examples
It is the one fixed unchangeable thing--fixed as the stars, more enduring than the mountains, as unalterable as the way of the Eternal.
Never a word to reproach her for the unalterable; it should be as though there were no gap between the old love and its renewal in the present.
There seemed to be no moment when it was in a condition of becoming, and she might have slipped in a suggestion or laid a wish before him; his plans were sprung upon her full fledged, and they were unalterable.
For a young person cannot judge what is allegorical and what is literal; anything that he receives into his mind at that age is likely to become indelible and unalterable; and therefore it is most important that the tales which the young first hear should be models of virtuous thoughts.