slouch

Short definition from Wiktionary

Noun

1. 1
   A hanging down of the head; a drooping posture; a limp appearance
2. 2
   Any depression or hanging down, as of a hat brim.
3. 3
   Someone who is slow to act.
4. 4
   An awkward, heavy, clownish fellow.

Verb

1. 1
   To hang or droop; to adopt a limp posture
2. 2
   To walk in a clumsy, lazy manner.
3. 3
   To cause to hang down or droop; to depress.