adverb
conversely; on the contrary; rather
Used to introduce a contrasting or opposite perspective, often to correct a previous assumption or to present an unexpected result. Can also soften a statement by framing it as the opposite of what was expected.
彼は怒っていると思ったが、逆に喜んでいた。
I thought he was angry, but on the contrary, he was pleased.
この薬は眠くなるどころか、逆に目が冴える。
Far from making you sleepy, this medicine actually makes you more alert.