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A Slouch

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

In the sense of "someone who is slow to act", sometimes used in the negative as a statement of praise. Being "no slouch" at something is generally understood to mean that the subject is respectably good in the field described.