bending, anfractuous, writhen, hooked, stooped, twisty, squiggly, akimbo, wry, awry, more...

straight, upright, erect

bent, crook, more...

not straight,   not on the level,   slightly askew,   not upright,   less than straight,   out of alignment,   not quite straight,   not plumb,   lopsided, as a grin,   bent in