expression, godan verb (-u)
handle roughly; treat carelessly; use roughly
Used when a person handles an object without care, causing damage or disrespect. Often implies a lack of appreciation for the item.
本を粗末に扱わないでください。
Please don't handle the books roughly.
彼は道具を粗末に扱うので、すぐ壊
He handles tools carelessly, so they break quickly.