weak point; poor at; not one's forte
Used to describe a subject, skill, or area where one is not good or confident. Often contrasted with 得意 (strong point).
Math is a subject I'm not good at.
彼は人前で話すのが不得意だ。
He is not good at speaking in front of people.
He's not good at math.
The subject I'm weak in is English.
Everyone has things they're good at and things they're not.