Common-sense truthfulnessTell us, at Christmas, youth's crassest of crass ages.
Therefore "the recognition of any special laws is a sign of the crassest ignorance."
I said I'd risk appearing the crassest, contradictoriest wretch that ever drew breath.
For four hundred years Israel had dwelt in Egypt, surrounded by the crassest idolatry.
1540s, from Middle French crasse (16c.), from Latin crassus "solid, thick, fat; dense." The literal sense always has been rare in English; meaning "grossly stupid" is recorded from 1650s, from French. Related: Crassly; crassness.