he completely …
Он совершенно безобидный человек.
He’s a completely harmless person.
He is completely useless.
He is completely unknown to me.
Он совершенно не интересуется тем, что происходит в мире.
He has absolutely no interest in what's going on in the world.
Он совершенно не любит летать.
He really doesn't like flying.
It is completely impossible.