Vulgar
Part of speech: adjective
Definition: Having to do with ordinary, common people. Debased, uncouth, distasteful, obscene.
Example sentence: I have never known a more vulgar expression of betrayal and deceit.
Informal
Part of speech: adjective
Definition: Not formal or ceremonious; casual.Not in accord with the usual regulations; unofficial.Suited for everyday use.Reflecting everyday, non-ceremonious usage.Not organized; not structured or planned.
Example sentence: When I took part in European leaders summits, it was sometimes unpleasant for me to hear Romanian, Polish, Portuguese, and Italian friends speak English, although I admit that on an informal basis, first contacts can be made in this language. Nevertheless, I will defend everywhere the use of the French language.