IPA: /ʌnˈvɛstɪd/
KK: /ʌnˈvɛstɪd/
Not yet fully owned or secured, often referring to rights or benefits that are still subject to conditions.
The employee's unvested stock options will become available after three years of service.
Unvested → It is formed from "un-" (meaning not) and "vested" (from Latin "vestire", meaning to clothe or to invest). The word "unvested" means not clothed or not invested, often referring to rights or benefits that have not yet been granted or secured.
Think of 'not' ('un-') having 'invested' rights or benefits — that's why unvested means those rights are not yet secured.