This refers to the act of negating or denying something. It can be used in various contexts such as language, logic, or personal statements to indicate that something is not true or does not exist.

This implies a more personal or emotional context where one does not accept the truth of something, often in relation to situations or feelings.

In this context, it refers to a negative expression or quality, which can be applied in both grammatical terms (like negative sentences) and emotional contexts (such as negativity in behavior or outlook).