Just do it painlessly.

As painlessly as possible.

She died quick and painlessly.

At least I can die painlessly

You can die quickly and painlessly --

I'll kill you painlessly like a pig

But do it quickly and... and painlessly.

Completely, painlessly, and without side effects.

I wanna leave as quickly and painlessly as possible.

let's try to get through this as painlessly as possible, what do you say?