1.  unchanging(s = adj.all) - conforming to the same principles or course of action over time;
Derived form noun unchangingness₁

2.  unchanging(s = adj.all) stable, static - showing little if any change; "a static population"
Derived form noun unchangingness₁

unchanging, adj. not changing; remaining the same.

Derivative:
unchangingly adv. unchangingness n.