Don't give me any lame excuses next time!
下次别再用这样蹩脚的借口！
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形容词lame的本意是“瘸的”（Disabled so that movement, especially walking, is difficult or impossible），用来形容借口、理由，就是“站不住脚的”（Weak and ineffectual; unsatisfactory）。
例句：
Having class on weekend is lame 周末上课是个馊主意。
Sleeping too long is a lame excuse for being late. 睡得过久而迟到, 这个借口站不住脚。
海纳百川，有容乃大；壁立千仞，无欲则刚。