Don't give me any lame excuses next time!
下次別再用這樣蹩腳的借口！
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形容詞lame的本意是“瘸的”（Disabled so that movement, especially walking, is difficult or impossible），用來形容借口、理由，就是“站不住腳的”（Weak and ineffectual; unsatisfactory）。
例句：
Having class on weekend is lame 周末上課是個餿主意。
Sleeping too long is a lame excuse for being late. 睡得過久而遲到, 這個借口站不住腳。
海納百川，有容乃大；壁立千仞，無欲則剛。