na-adjective, noun
poor at; weak in; not good at
Describes a lack of skill or ability in a subject, task, or activity. Often used with ～が苦手.
私は数学が苦手です。
I'm not good at math.
彼は人前で話すのが苦手だ。
He is poor at speaking in public.
na-adjective, noun
not one's cup of tea; not one's favorite; dislike
Expresses personal dislike or aversion, not necessarily lack of ability. Often used for foods, people, or situations one finds unpleasant.
納豆は苦手なんです。
Natto is not my cup of tea.
彼女は虫が苦手だ。
She dislikes insects.