The person in the room that does not talk to anyone or talks very little. This person is usually very smart, polite, nice, and wise but will go unnoticed, but in contrast they can be extremely insulting and cold, if they wanted to be, as they don't care too much for nor about what people think.
The quietest kid in the room is really the biggest crook.

The quiet kid is possibly the nicest, politest, and smartest people you will ever meet. Likewise, they have the potential to be the most dangerous.
by Laleiluleilo October 24, 2011
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They are pretty chill and usually pretty smart as well. They rarely ever talk and are pretty good friends. If you piss them off, you won't survive the school year.
Person 1: is the quiet kid as dangerous as people describe him?
Person 2: No
Person 1: oh ok that's nice
Person 2: He is much more deadly seriously DONT MESS WITH THE FRICKING KID!
Person 1: Ok!........
by ltklegend100 November 10, 2020
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Lots of schools have this kind of kid called the "quiet kid" . Who are they? What do they do to us? They usually don't talk alot, we don't know what do they feel but we might thought that he or she is gothic, rude, bad. But some of them are, but some of them aren't rude. We hate them because they are boring or faking depression. But inside of a quiet kid is fun, they never shown themselves, they are shy and quiet in school. However, when they go home, they go loud.

Im a quiet kid too.

Most teachers know that shy students are like anyone else in their class: we want to reach them and hope that they have a good class experience. I have never known a teacher to dislike a shy student, if that is what you are asking. ... As an introvert myself, I relate to these students very well!

From: What do teachers think of shy students? - Quorawww.quora.com What-do-teachers-think-of-shy-students
by XXEnds September 28, 2020
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The kid that sits in the back of the class and usually keeps to themselves. Some people think they're weird or emo or gay, but to me they're pretty chill. Most of them don't talk because they are anxious and don't have very good social skills. Or they just dont like you. Sometimes they have friends, but they talk to them awkwardly or dont even want to be friends in the first place but they dont want to sound rude.
Person 1: "What group were you in when you were in high school?"
Person 2: "I was a quiet kid. I never really liked socializing and only talked when I needed to."
by picklebutt230 February 2, 2023
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Used as a polite phrase or an alternative to shut up to an annoying kid who is probably over sensitive and like a snow flake and will cry when told to shut up.
Limpeh: Kskxkwxkkskdkka
Ah long: Tf you saying???
Chew Kok: Quiet kid!!!
by - Bully Maguire Pizza Time December 17, 2021
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A quiet kid in school. Never speaks to anyone if they didn’t have to. They usually are very smart and loyal, but they can come off as stuck up or too good to say hello to you( which isn’t true). On breaks they usually read or draw, while others are flipping bottles and drawing dicks on the white board. And unfortunately they can be targets for bullying. They may come off as creepy and dangerous, but always be nice to them.. because for the moment they shoot up the school, they may spare you for giving them that peice of juicy fruit without them asking for it.
Loud black girl: AYO THERE A NEW KID IN DA CRIB, HII
Quiet kid: ...
by kid slicc September 12, 2018
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The quiet kid is usually a kid in school who is considered quiet and/or silent. In meme culture the quiet kid is considered the most badass person in the class and be able to kick everybody's ass. Example of this is include Light Yagami from Death note and Onision's self inserts in his books. Alot of the quiet kid memes is likely there for the author to self insert themself as a cool kid since alot of internet users was themself quiet as a kid. Alot of the jokes also revolve aroud "school shooting happens, lol"
student 1: "Hi"
Quiet kid 1: "..."
by Wulmer May 31, 2021
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