Lacking sensitivity, refinement, or intelligence; showing a crude disregard for others' feelings. Characterized by gross insensitivity or ignorance.
From Latin 'crassus' meaning thick, dense, or stupid. The word entered English in the 15th century, evolving from physical thickness to mental/emotional denseness.
Think of 'grass' that's been trampled - it's thick, crude, and insensitive to being walked on. Crass people are like thick grass - dense and unrefined!
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