General terms:
* Colloquial: This term refers to everyday language used in a particular region or group.
* Slang: This term refers to informal words and phrases that are often used within a specific group.
* Vulgar: This term refers to language that is considered offensive or inappropriate in formal settings.
* Informal: This is a broad term that encompasses any language that is not formal.
More specific terms:
* Casual: This term refers to relaxed and informal language.
* Conversational: This term refers to language used in spoken conversation.
* Jargon: This term refers to specialized language used by a particular group, such as a profession or hobby.
* Street slang: This term refers to informal language used in urban environments.
* Vernacular: This term refers to the language of a particular place or group.
Other options:
* Everyday language
* Informal speech
* Spoken language
* Familiar language
The best term to use depends on the context and the specific type of informal language you are referring to.