随便

Hold or sell, as you consider best.

Do as you like, please. / Have it your own way.

The subject deserves more than passing consideration.

He doesn't give much thought to what he says.

He was casually dressed.

Be careful what you say.

Help yourself!

Don't answer at random; think first.

Loosen up, this isn't a formal occasion.

not offer opinions casually

make a casual comment

open a book at random

Anything will do.

I don't care how far it is; I'll have to go.

He doesn't care at all what others say behind his back.