Doubt, Question
noun
A doubt problem is caused by having too much doubt. Just think about it. Don't doubt yourself, it's why you're getting those vocab words wrong! :P
ぎもん
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.
コウイチが本当に肉を食べられないかは疑問です。
It's doubtful whether Koichi actually can't eat meat.
その考えには、少し疑問を持つ人も多いんじゃないでしょうか。
I think a lot of people might have some doubts about that idea.
それって本当に必要なんでしょうか。正直、私は疑問に思います。
Is that really necessary? Frankly, I doubt it.