Crass (kr?s), a. [L. crassus thick, fat, gross, prob. orig., closely woven. See Grease animal fat, and cf. Crate, Hurdle.] Gross; thick; dense; coarse; not elaborated or refined. “Crass and fumid exhalations.” Sir. T. Browne. “Crass ignorance” Cudworth.
[1913 Webster]