IPA: /ˈsɛlf.ləs.li/
KK: /ˈsɛlf.ləs.li/
In a way that shows concern for others rather than oneself, often putting others' needs before one's own.
She selflessly volunteered to help the community during the crisis.
Selflessly → It is formed from "self" (from Old English "seolf", meaning oneself) and "-less" (meaning without). The word "selflessly" means acting without regard for oneself or one's own interests.
Think of 'self' as referring to oneself and '-less' meaning without — so selflessly means acting without thinking of oneself.