adj. 25B6; adjective
crude oil : UNREFINED, unpurified, unprocessed, untreated; unmilled, unpolished; coarse, raw, natural.
a crude barricade : PRIMITIVE, simple, basic, homespun, rudimentary, rough, rough and ready, rough-hewn, make-do, makeshift, improvised, unfinished; dated rude.
crude jokes : VULGAR, rude, naughty, suggestive, bawdy, off colour, indecent, obscene, offensive, lewd, salacious, licentious, ribald, coarse, uncouth, indelicate, tasteless, crass, smutty, dirty, filthy, scatological; informal blue.
refined, sophisticated.