disciplinarian
n
person who believes in strict discipline 嚴格執行紀律者; 嚴守紀律者
a good/strict/poor disciplinarian 能[嚴格/不能]執行紀律者
He's no disciplinarian, ie He does not or cannot maintain discipline. 他不能維持紀律.
??? 情景例句
You will waste a lot of money trying to keep up with the newest fashions every year.