A noun can be a proper noun or a common noun.
A proper noun is the name or title of a specific person, place, or thing.
A common noun is a general word for any person, place, or thing.
A common and a proper noun are different forms of noun, not opposites. For example, the common noun building becomes a proper noun as Empire State Building.
The common noun building is not the opposite of the proper noun Empire State Building.
The opposite of "not right" is...right (correct, or proper).
Proper.
Improper.
improper
The proper noun "Jackson" can be either masculine or feminine and so has no opposite gender.
With proper respect
The proper spelling is "experienced". The opposite is "inexperienced".
The opposite of being glad is often being sorry or sad. In some uses, the proper adjective can be sorrowful.
The proper noun (name) Jackson is a common gender noun, a word for a male or a female.
Improper behavior is fooling around and horseplay. Proper is the opposite
The name Akarman is a proper noun and surnames do not often have opposites.
No, "back" is not a proper noun. It is a common noun used to refer to the rear part of something or the opposite direction of forward.