rigid 严格的，死板的，固执的

　　My father is very rigid in his thinking.

　　我父亲的思想非常死板。

　　You will not lose weight if you can't stick to this rigid eating program.

　　如果你无法坚持这个严格的饮食计划，你瘦不下来的。

　　疯狂练习吧！