bungler
blunderer
fumbler
bumbler
stumbler
sad sack
botcher
butcher *
fuckup

He looked at me like I was one sad sack.

He'd become such a sad sack that even his wife had left him.

He's a sad sack, and I feel bad about turning him in.

Some of these sad sacks probably even make their crimes up.

What about our national obsession with the sad sack who used to play baseball so very well?

"So it has come to this at last, sad sack!"

I thought he was sort of a sad sack in there all by himself while everyone else was at the service.

Ann is a librarian and a bit of a sad sack.

If your book isn't going well, you're miserable and I don't want a sad sack for a groom.

I just don't want to hang around this bunch of sad sacks.