Undefined 

See the example below.

See the above definition for undefined.

Undefined by Mr. Bodkin Newberry August 22, 2007

Undefined 

The worst curse word in math

Ugh this math is frustrating! ITS SO UNDEFINED!!

Undefined by InS4nity HD October 13, 2016

undefined 

A word in the urbandictionary that is lacking definition.

This word was previously undefined.

undefined by Denis Baldwin June 3, 2004

Undefined 

What you wish half of the words on here were.

Undefined. Magical Word.

Undefined by Jaibow August 29, 2011

Undefined 

⠀

Person 1: undefined
Person 2: Ah, yes, indeed.

Undefined by h is a pog letter pog pog pog February 25, 2021

undefined 

The word that just popped up when you searched for a word that isn't in urban dictionary.

You: WTF!11!!ONE!!! UNDEFINED??!?!?!! WTF!

undefined by PiracyX September 9, 2009

Undefined 

Welp

Good job guys the word undefined is the most trending word on a dictionary. Way to fuckin go

Undefined by Canada amazin January 18, 2018