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のが苦手だ

be bad at; be not good at

→ の
phrase Rare #22,352
be bad at; be not good at Used after a verb in its plain form to say that someone is not good at doing something. The の turns the verb into a noun-like expression. The exact ending may change with politeness or sentence context, such as のが苦手です or のが苦手なのよ, but the dictionary-form term is のが苦手だ.
JA: 私は即興で話すのが苦手だ。
EN: I'm bad at speaking spontaneously.

私は即興で話すのが苦手だ。

I'm not good at speaking off the cuff.

トムは体を動かすのが苦手だ。

Tom isn’t good at physical activities.

トムは空気読むのが苦手だよ。

Tom is bad at reading the room.

トムはじっと立っているのが苦手だ。

Tom has trouble standing still.