though

despite the fact that:

She hasn't called, even though she said she would.

They're coming next week, though I don't know which day.

He blurted everything out about the baby, though we'd agreed to keep it a secret for a while.

I play the piano tolerably well, though I have no particular talent for it.

Even though she hasn't really got the time, she still offered to help.

as though - as if:

You look as though you've been running a marathon!