From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
rubes /ɹˈuːbz/
Hinterwäldler <pl>, Bauerntrampel <pl>, Bauernlümmel <pl>, Bauerntölpel <pl>
Synonyms: backwoods men, country bumpkins, bumpkins, country gawks, yokels, culchies, bogmen, hayseeds, hillbillies, hicks, schlubs
see: backwoods man, country bumpkin, bumpkin, country gawk, yokel, culchie, bogman, hayseed, hillbilly, hick, rube, schlub