unipolar disorder 

Opposite of bipolar

Tommy has a bipolar disorder, he has split personalities. However I have a unipolar disorder.

unipolar disorder by TaylorFoster November 8, 2007

UniPolar Disorder 

A mental health disorder characterized by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life.

I don't know how to use UniPolar Disorder in a sentence

UniPolar Disorder by CrimsonVixen February 27, 2018

Unipolar Disorder 

When someone isn't bipolar but has the symptoms

Steven: My Mom for some reason acts really sweet but if you forget to do something, she goes Uma Thurman on your ass
Chris: I think your mom has Unipolar Disorder

Unipolar Disorder by Whythisword January 20, 2021