His efforts to help underprivileged students are praiseworthy.

praiseworthy 是由 praise（赞扬）和 worthy（值得的）组成的复合形容词，字面意思是"值得赞扬的"。praise 表示"表扬、称赞"，worthy 表示"有价值的、值得的"，两者组合起来形容值得称赞的行为或品质。