IPA: /ˈhɑːrʃli/
KK: /hɑrʃli/
In a way that is very severe or cruel; not gentle or kind.
The teacher spoke harshly to the students who were misbehaving.
Harshly → It is formed from "harsh" (from Old English *earsce*, meaning rough or severe) and the suffix "-ly" (meaning in a manner of). The word "harshly" means in a manner that is rough or severe.
Think of something being done in a 'rough' or 'severe' way — that's what 'harshly' means.