changeless vs unvarying

changeless and unvarying both are adjectives.

Word	Noun	Adjective	Verb	Adverb
changeless	No	Yes	No	No
unvarying	No	Yes	No	No

As adjectives, changeless and unvarying are synonyms defined as:

Other synonyms of changeless include constant, invariant.

changeless (adjective)	unvarying (adjective)
not subject or susceptible to change or variation in form or quality or nature	lacking variety
unvarying in nature	always the same; showing a single form or character in all occurrences
remaining the same for indefinitely long times	unvarying in nature