heartily

I heartily subscribe to that sentiment.

they had partaken heartily of the Christmas cheer.

wished heartily that they would leave.

they were heartily sick of the whole subject.

I am heartily sick of them.

He was heartily satisfied with the arrangement.

I'm heartily tired / sick of your endless complaints.

He ate heartily and went out to look for his horse.

He laughed heartily at his own joke.