Completely

a completely different ball game

By that logic/rationale you would have to completely cut off the Internet just because a few...

completely rounded

He left me completely in the dark about his plans

He was completely baffled

He was completely lacking in courage

Her husband has her completely under his thumb

His life is completely taken up by work

I reject that completely!

I was completely browned off

I was completely quiet.

It took me completely by surprise.

It’s a completely different ball game

That's completely inappropriate.

Then everything got completely out of hand/out of control