IPA: /ˈstɜrnər/
KK: /ˈstɜrnər/
More strict or serious than someone or something else.
The teacher's sterner approach helped the students focus better on their studies.
Sterner → It is formed from "stern" (from Old English *styrne*, meaning severe or strict) and the comparative suffix "-er" (meaning more). The word "sterner" means more severe or strict than something else.
Think of someone being 'more strict' or 'more severe' — 'stern' describes a strict demeanor, and '-er' indicates a comparison.