Fault, Defect, Flaw, Weakness, Weak Point
Noun
けってん
だれだって、何かしらの欠点をもってるものさ。
Everyone has some sort of weakness.
そうだ、ちょっと思い出したんだけど、かの女って欠点がないんだよ。
Oh, I just remembered, she doesn't have any faults.
私は欠点がありすぎるので、絶対にプロのサッカー選手にはなれません。たとえば、私には足がありません。
I’ll never become a professional soccer player because I have too many shortcomings, for example, I don’t have any legs.
You have a lack of points. These are things about yourself you wish were better. These are your shortcomings.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just watch out because けつ is being shortened to けっ here!