Lewis & Short

pulvĕrŭlentus, a, um, adj. [pulvis].

  1. I. Lit., full of dust, dusty: via, Cic. Att. 5, 14, 1: aestas, Verg. G. 1, 66: femina, Prop. 3, 14 (4, 13), 7: amnis, Ov. Am. 3, 6, 96; hence, also: Ceres, covered with dust in summer, Lucr. 5, 742: agmina, Verg. A. 4, 154.
  2. II. Trop., attended with labor: praemia militiae, i. e. toilsome, Ov. Am. 1, 15, 4: virtus, Sen. Vit. Beat. 7, 3.