Unteachable \Unteachable\
See {teachable}.
27 Moby Thesaurus words for "unteachable": Boeotian, asinine, beef-brained, beef-witted, blockish, bovine, chumpish, cloddish, cowish, crass, dense, doltish, dullard, dumb, duncical, duncish, fat, gross, ineducable, klutzy, lumpish, oafish, opaque, sottish, stupid, thick, wrongheaded