Bent,
broken,
dastardly, or just plain
evil perhaps. You would consider things like
The Mob to be crooked, but some
mobsters would take offense, and suggest that better examples are
used car dealers or (shudder)
used computer dealers.
Laywers aren't necessarily crooked, really, they just
lie a lot.
Or there's other cases of things just being plain
out of whack, such as
The Leaning Tower of Pisa which is doing a pretty good job of falling over in
slow motion.