harsh

harsh - adjective

unpleasantly stern
disagreeable to the senses
of textures that are rough to the touch or substances consisting of relatively large particles
unkind or cruel or uncivil
severe
sharply disagreeable; rigorous

harsh - thesaurus

Scrabble score = 11

"I love your course..... you explain so much that I didn't know, forgot, or wasn't taught."

Adult student, USA