IPA: /ˈwɜːrθˌwaɪl/
KK: /ˈwɜrθˌwaɪl/
Describing something that is valuable or important enough to justify the time, money, or effort spent on it.
Volunteering at the shelter was a worthwhile experience for everyone involved.
Worthwhile is formed from "worth" (from Old English "weorþ", meaning value or merit) and "while" (from Old English "hwila", meaning a period of time). The word "worthwhile" means something that has value or merit over a period of time, indicating that it is deserving of time and effort.
Think of something that has 'value' ('worth') over a 'period of time' ('while') — that's why we say it's worthwhile.