IPA: /ˈtʃeɪndʒləsli/
KK: /ˈtʃeɪndʒləsli/
In a way that does not change or vary; remaining constant over time.
The seasons change, but the mountains stand changelessly against the sky.
Changelessly → It is formed from "change" (from Old French *changier*, meaning to exchange or alter) and "-less" (meaning without) and "-ly" (meaning in a manner). The word "changelessly" means in a manner that is without change or unchanging.
Think of being 'without' ('-less') 'change' — that's why 'changelessly' means to be unchanging.