immutable
By: Muyan Pan
adjective
Never changing or varying, unchangeable.
Synonyms
fixed, set, permanent
Antonyms
variable, flexible, unstable
Sentences
1. From the naked eye, the continents seem immutable because they only move a few inches over a period of million years.
2. The laws of the Constitution have been immutable since the founding fathers wrote them.
Einstein's Proof of E=mc²