Tsundere is a Japanese term for a character development process that describes a person who is initially cold (and sometimes even hostile) before gradually showing a warmer, friendlier side over time. The word is derived from the terms tsun tsun, meaning to turn away in disgust, and dere dere meaning to become 'lovey dovey'.
IT'S NOT LIKE I LIKE YOU OKAY! -Tsundere
by Monika :3 May 31, 2018
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A cute ass boy or girl who doesn’t know how to express their feelings to you so they are mean instead
Girl: hey wanna walk to school together?
Tsundere: uh... sure.. but it’s not like I like you or anything! ..... dummy!
by Greatlord Cthulhu November 28, 2020
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A person usually a girl that gets blushed over little things said by her/his crush and talk non-sense because her/his heart is skipping light speed. Tsunderes change emotions very quickly, I could call them little scary but also cute.
Example:

George: Hey Alice, I liked your performations today in the gym class!

Tsundere Alice: Uhmm.. I mean I.. I THANK you! You.. you weren't baddd EITHER! (Blushed
by Writer of Urban Dictionary March 24, 2019
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A word weebs use to describe girls that hate them
"She blocked me on Instagram, Twitter, and Snapchat and is filing a restraining order. She's such a tsundere!"
by Not_Andy April 30, 2020
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A tsundere is someone, who switches from being tough and cold towards a love interest into being soft and sweet.
Mk56 is a tsundere when he bullies Cross and then proceeds to buy her lunch.
by Zeebot24 January 22, 2021
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Tsundere (ツンデレ ?, pronounced tsɯndeɽe) is a Japanese term for a character development process that describes a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time.
she was being a tsundere tody
by cachunda24 June 24, 2016
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The Great Mammon, Avatar of Greed, from the hit games Obey Me! And Obey Me! Nightbringer
Person 1: Did you know that Mammon, from the game Obey Me! Is a massive tsundere
Person 2: yeah bro that’s just common knowledge.
by The Great Ren June 16, 2023
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