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Esp., of the atmosphere, thick, dense, heavy: aër crassus et concretus, Cic. Tusc. 1, 18, 42; cf.: crassissimus aër, id. N. D. 2, 6, 17: caelum Thebis (opp. tenue Athenis), id. Fat. 4, 7: Baeotum in crasso jurares aëre natum, Hor. Ep. 2, 1, 244; Juv. 10, 50: caligo nubis, Lucr. 6, 461; cf.: caliginis aër Crassior, id. 4, 350 al.: vitrum crassiore visu, less transparent, Plin. 36, 26, 67, § 196.
Trop. (rare; not in Cic.): crassum infortunium, i. e. a sound beating, Plaut. Rud. 3, 5, 53: senes, stupid, dull, Varr. ap. Non. p. 86, 24: Ofellus Rusticus abnormis sapiens crassāque Minervā, i. e. dull, stolid, Hor. S. 2, 2, 3; cf.: crassiore ut vocant Musa, Quint. 1, 10, 28: turba, uncultivated, Mart. 9, 23: neglegentia, stupid, clumsy, Dig. 22, 6, 6: crassiora nomina, more rude or barbarous, Mart. 12, 18, 12; cf. Gell. 13, 20, 15.—Hence, adv.: crassē (rare; not in Cic.), thickly. Lit.: picare vasa, Col. 12, 44, 5; cf. oblinere, Scrib. Comp. 46.
Grossly, rudely: crasse illepideve compositum poëma (the figure taken from a coarse web), Hor. Ep. 2, 1, 76.—Of precious stones, not clearly, dimly (comp.), Plin. 37, 7, 31, § 106; 37, 8, 36, § 114.—Hence of the indistinct understanding of any thing, not clearly, confusedly: crasse et summatim et obscure intellegere aliquid, Sen. Ep. 121, 11.