IPA: /ʌnˈmeɪtɪd/
KK: /ʌnˈmeɪtɪd/
Not joined or paired with a mate or partner.
The unmated birds were searching for a companion.
Unmated → It is formed from "un-" (meaning not) and "mate" (from Old English "gemetta", meaning a companion or partner). The word "unmated" means not having a mate or partner.
Think of 'not' ('un-') having a 'companion' ('mate') — that's why unmated means without a partner.