WHAT IS THE OPPOSITE WORD TO PROPER?

The opposite of proper depends on the context. Here are a few possibilities:

General opposites:

* Improper

* Inappropriate

* Unbecoming

* Unfitting

* Wrong

* Incorrect

More specific opposites:

* Informal (opposite of formal proper)

* Casual (opposite of proper dress)

* Untidy (opposite of proper appearance)

* Faulty (opposite of proper functioning)

Example:

* "That's not a proper way to behave!" (opposite: improper)

* "This is a proper noun." (opposite: common noun)

To provide the best opposite for "proper," please give me more context!