Webster's Revised Unabridged Dictionary · 1913

Crass

Crass (kr?s) , adjective

[Latin crassus thick, fat, gross, prob. orig., closely woven. See Grease animal fat, and compare Crate, Hurdle.]

Gross; thick; dense; coarse; not elaborated or refined.
Crass and fumid exhalations. — Sir. T. Browne
Crass ignorance — Cudworth