Unlucky is losing a couple games. When you lose double digit games, that means you just plain suck. He should actually feel very lucky, that some team is foolish enough to pay him a lot of money to suck, to just be bad at his job. It's like he works for the government or something.
If he was a RB or WR, he would have been out of the league already, but somehow, bad QB's are tolerated and paid for way too long. This dude's made quite a bit of money playing bad football, I would call him extremely lucky. It's time that his luck runs out!