BEFOUL Meaning of BEFOUL in English verb 1.Synonyms: contaminate 2, foul, pollute 2.Synonyms: malign , bespatter, blacken, defame, denigrate, slander, slur, smear, spatter, traduce Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003