上手ではない

not good at

→ 上手だ
phrase Rare #32,574
not good at A polite way to say that someone is not skilled at something. The thing someone is not good at is often marked with が, as in 歌が上手ではない (not good at singing).
JA: 私は絵を描くのが上手ではない。
EN: I’m not good at drawing.

私の英語は決して上手ではない

My English is by no means good.

彼はテニスがちっとも上手ではない

He's not good at tennis at all.

僕はあまりテニス上手ではない

I'm not very good at tennis.