foible|foibles

击剑时，攻击对方剑身的弱部比强部更有效。

In fencing, targeting the ___foible of your opponent's blade is more effective than hitting the forte.

他总是忘记关灯，这只是他的一个小缺点。

Forgetting to turn off the lights is just one of his ___foibles.

虽然他很聪明，但总是迟到是他的小缺点之一。

Though he's brilliant, his habit of always being late is one of his ___foibles.