IPA: //ʌnɪkˈspaɪəd//
KK: /ʌnɪkˈspaɪəd/
Still valid or in effect; not yet expired.
The coupon is unexpired, so you can still use it for your purchase.
Unexpired → It is formed from "un-" (meaning not) and "expired" (from Latin "exspirare", meaning to breathe out or to come to an end). The word "unexpired" means not having come to an end or still valid.
Think of 'not' ('un-') having 'ended' ('expired') — that's why unexpired means something that is still valid or has not ended.