Undane 

unequatable, does not amount to anything else

She has an undane passion for sex.

Undane by blackmail102 October 25, 2008

undyne 

Undyne is a badass woman who can flex a rock for no reason!

Undyne is undying!

undyne by Undertale Flowey April 3, 2016

undyne 

A lesbian warrior fish from a game called Undertale.

Undyne is a fucking badass.

undyne by MrDeppresst November 14, 2018

undyne the undying

A badass that will kill you make you rage and brake your computer

Mom I broke my screen fighting undyne the undying

undyne the undying by Undertalethebest August 12, 2017

undyne 

salty ass fish

" that girl is so undyne

undyne by ewsaltyweeaboo January 3, 2016

Undine 

Is a very smart, beautifull and hot girl, maybe she is the hotest girl you have ever seen. Love her and show that you love her than she love you.

Undine you are hot.

Undine by Melody of Time January 2, 2017

Undyne 

Species: Fish
The captain of the Royal Guard in the indie game, UnderTale.
Is lesbian and has a crush on the Royal Scientist Alphys.

SPOILER ALERT!
Fights with spears. Her goals are to take your soul and to set the monsters free.
Extremely powerful, can change your soul into a Green color, giving you a spear to block her own attacks.

Will transform into Undyne the Undying on a Genocide Route.

I, Undyne, will strike you down!

Undyne by Professor Atomix March 21, 2021