gaga

Example:He’s a true hater, not a gaga at all.

Definition:A person who detests or strongly dislikes something; an opponent.

Example:Stranger is the opposite of gaga; you don't know them at all.

Definition:A person not known or unfamiliar to another; a stranger is not personally acquainted with another or others.

Example:Her beauty and charm could be described as strange, not gaga.

Definition:Not usual or normal; unfamiliar or anomalous.