I miss him terribly.

我非常思念他。

《牛津词典》

I miss him.

我想念他。

youdao

I haven't seen my grandpa for a long time. I miss him so much.

我很久没见到我爷爷了。我非常想念他。

youdao

"My dad is fine, he's fine, but I miss him a lot, " said Sepulveda's daughter.

CNN: New video shows trapped Chilean miners in good spirits

As I said, I miss him a lot and think about him often, and I wish I could call him up and tell him how much he will be missed.

CNN: [A. Todd Rancke]

Since he's been gone, I miss him every day.

CNN: 'Rogue' DHS unions follow Obama's lead on deportation