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Adjective: muscly (musclier,muscliest)  mú-su-lee
  1. (of a person) possessing physical strength and weight; rugged and powerful
    "a muscly athlete";
    - brawny, hefty, muscular, powerful, sinewy
  2. Of or relating to or consisting of muscle
    "muscly contraction";
    - muscular

Derived forms: muscliest, musclier

See also: strong