Apt rhyme for "lewd” (4)
(Other definitions for rude that I've seen before include "Impolite, without consideration" , "Insolent" , "Impolite - obscene" , "having no manners?" , "Uncivilised" .)
(Other definitions for crude that I've seen before include "In a natural or raw state" , "Raw, unrefined" , "Not expertly made" , "Uncouth" , "Cured (anag.)" .)