No and to the hell with him (it) be careful/watch out/look out There's no doubt, it goes without saying Hold your tongue/watch it

1. No and I don't care (about subject). 2. Be careful / Watch it. 3. No doubt, of course / sure. 4. Keep your mouth shut. (a little unpleasant)

there is no , and do not worry about it -Нет и фиг с ним. Beware - Осторожно. there is no doubt -нет сомнения , Само собой ( разумеется )-that'll come naturally. hold your tong -придержи язык

1. It doesn't matter to me. I can do without that. 2. ... 3. Certainly. 4. hold your tongue.

Осторожно - context is important here.