expression, suru verb (irregular)
waste; squander; not make good use of
Used for wasting time, money, effort, opportunities, or resources. Often implies a sense of regret or missed potential.
時間を無駄にしないでください。
Please don't waste time.
彼はチャンスを無駄にした。
He wasted the opportunity.
食べ物を無駄にするのはよくない。
It's not good to waste food.