Lewis & Short

squālĭdus, a, um, adj. [squaleo].

  1. I. (Acc. to squaleo, I.) In gen., stiff, rough (ante-class.): corpora, Lucr. 2, 469: membra, id. 5, 956: serpentis squamae squalido auro et purpurā praetextae, Att. ap. Gell. 2, 6, 23; id. ap. Non. 452, 28 (Trag. Fragm. v. 517 Rib.).
  2. II. (Acc. to squaleo, II.) In partic.
    1. A. Stiff with dirt, dirty, foul, filthy, neglected, squalid (poet. and in post-Aug. prose): stola, Enn. ap. Non. 537, 26 (Trag. v. 373 Vahl.): homo horridus et squalidus, Plaut. Truc. 5, 41 sq.; Ter. Eun. 2, 2, 5: squalida et prope efferata corpora, Liv. 21, 39, 2: carcer, Ov. Am. 2, 2, 42: sudor, Stat. Th. 3, 127: cultus, Sen. Troad. 883: squalida siccitate regio, Curt. 7, 4, 27: rubigo, Cat. 64, 42: humus, Ov. F. 1, 558: Hispania, uncultivated, Plin. 37, 13, 77, § 203.
      Esp., of persons in mourning: reus, Ov. M. 15, 38; Quint. 6, 1, 30; Tac. H. 2, 60; cf. senectus, Plin. Ep. 4, 9, 22.
    2. B. Gloomy, obscure (late Lat.): nocte squalidā et interluni, Amm. 19, 6, 7: squalidi Solis exortus hebetabant matutinos diei candores, id. 31, 1, 2.
    3. C. Trop.
      1. 1. Of speech, rude, unadorned: suā sponte (haec) squalidiora sunt, Cic. Or. 32, 115.
      2. 2. Wretched, incurable: scientiam omnem squalidā diversitate confundere, Amm. 26, 1, 10.
        * Adv.: squālĭdē, without ornament, rudely: squalidius dicere, Cic. Fin. 4, 3, 5; Amm. 25, 2, 3.