IPA: /ʌnˈbiːtən/
KK: /ʌnˈbitn/
Not defeated in a competition or contest; also refers to something that has not been beaten or pounded, like eggs.
The team remained unbeaten throughout the season, winning every match they played.
Unbeaten → It is formed from "un-" (meaning not) and "beaten" (the past participle of "beat", which comes from Old English "beatan", meaning to strike or hit). The word "unbeaten" means not having been struck or defeated.
Think of 'not' ('un-') having been 'struck' or 'hit' ('beaten') — that's why unbeaten means not defeated.