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Adjective: sullen (sullener,sullenest)  sú-lun
  1. Showing a brooding ill humour
    "a sullen crowd";
    - dark, dour, glowering, glum, moody, morose, saturnine, sour
  2. Darkened by clouds
    "a sullen sky";
    - heavy, lowering[2], threatening, lowery, loury, louring

Derived forms: sullener, sullenest

See also: cloudy, ill-natured

Encyclopedia: Sullen