IPA: /ʌnˈtʃeɪnd/
KK: /ʌnˈtʃeɪnd/
Not changed or altered; remaining in the same state as before.
The rules of the game remained unchanged despite the new season.
Unchanged → It is formed from "un-" (meaning not) and "changed" (from Old English "cealdian", meaning to make different). The word "unchanged" means not made different or remaining the same.
Think of 'not' ('un-') making something 'different' ('changed') — that's why unchanged means it has not been made different.