■ adjective showing a gross lack of intelligence or sensitivity.
crassitude noun
crassly adverb
crassness noun

C15 (in the sense ‘dense or coarse’): from L. crassus ‘solid, thick’.
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Concise Oxford Thesaurus
crass
▶ adjective STUPID, insensitive, mindless, thoughtless, witless, oafish, boorish, asinine, coarse, gross, graceless, tasteless, tactless, clumsy, heavy-handed, blundering; informal ignorant, pig-ignorant.

intelligent.
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EngMac
crass
глуп; груб
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English-Serbian dictionary
Crass
Glup-Grub
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Merriam-Webster Collegiate® Dictionary
crass
Pronunciation: ‘kras
Function: adjective
Etymology: Latin crassus thick, gross
Date: circa 1625

1 a : GROSS 6A especially : having or indicating such grossness of mind as precludes delicacy and discrimination b : being beneath one’s dignity c ― used as a pejorative intensifier
2 : guided by or indicative of base or materialistic values
synonyms see STUPID
–crass·ly adverb
–crass·ness noun