i Register
In some senses, harsh is marked as slang. Watch for register when choosing this word.
VERBS
appear, be, prove, seem, sound
The teacher's feedback sounded harsh, but it actually helped me improve my writing.
become
ADV
exceptionally, extremely, particularly, very | increasingly | a bit, a little, rather, somewhat
unduly, unnecessarily
The teacher's criticism was unnecessarily harsh and hurt the student's confidence.
surprisingly