Certainly not gentlemen, 4 letters
Dirty rotten scoundrels, 4 letters
Kin to blackguards and knaves, 4 letters
Men whom women can't trust, 4 letters
Poor dating prospects, 4 letters
Slap-worthy fellows, 4 letters
Thersitical fellows, 4 letters
They're no gentlemen, 4 letters
Ungentlemanly chaps, 4 letters
Ungentlemanly creeps, 4 letters
Ungentlemanly fellows, 4 letters
Ungentlemanly sorts, 4 letters
Untrustworthy types, 4 letters