or not

Second-guessing add-on

A tag that negates or casts doubt on what precedes it.

Sometimes it signals genuine uncertainty: I'll be there at six, or not, depending on traffic.

More often it's dismissive or sarcastic, rejecting a previous statement entirely: Maybe he's a genius—or not.

The phrase whether or not means regardless of which possibility holds.

Standalone, or not became a punchline after the film Wayne's World popularized it as a way to instantly retract enthusiasm.

Related

perhaps · uncertain · up in the air · doubt · hesitate · question · indecision · on the fence · choice · alternative · decide · waver · fence · limbo · dilemma · Hamlet · existential · torn

Opposites
certainty/commitment

or notdefinitely

With complete certainty

certainly · absolutely · for sure · without a doubt · undoubtedly

affirmation/negation

or notand so

Logical connector forward

indeed · in fact · as expected · confirmed · of course

optionality

or notnecessarily

As an unavoidable consequence

required · mandatory · obligatory · must · compulsory

Family

or, not, nor

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G