He's not lazy. On the contrary, I think he's a hard worker
I didn't like him much, in fact I hated him
"Have you finished?" "On the contrary, I have not even begun yet.
He is not rich. On the contrary, he is deep in debt
It isn't true that Jack is no good at music; on the contrary, he plays the piano well
"I believe you like your job" "On the contrary, I hate it"
This dictionary is useful to beginners, yes, and to advanced learners
"Have you finished?" "On the contrary I have not even begun yet.
"Have you finished it?" "On the contrary, I'm just starting.