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adj. (slang, humorous)
denoting a person or behaviour that is serious or formal; concerned with the matter at hand; not casual

A fallaciously derivative antonym of the word nonchalant. "Nonchalant" is actually a standalone word borrowed from the French "nonchaloir" meaning "unconcerned". We never took the word "chaloir", however, and turned it into "chalant". We could have done, but we didn't.

All that said, treating that first syllable as a prefix (which it was in the French) and extrapolating that chalant must be an antonym of nonchalant is actually reasonably logical and reflects the historically procedural manner in which the English language is developed.

Nonetheless, at this point in time the word is only legitimate as a form of humorous slang.
While his manner could not be described as nonchalant, he had already enjoyed too much wine to be truly chalant.
chalant by The Real NH April 29, 2020
1. Extreme concern about an object.
2. Concerned
A chalant person is very concerned about every little detail
chalant by Metz November 4, 2003
Smart,Funny Pretty,Ratchet big booty hoe
Damn did you see chalandae her ass Fat
chalandae by J fona July 17, 2017

chalantly 

To remove the non from a word to seem cool, but really just piss everyone off.
Ammar said chalantly.
chalantly by DesiDaroo January 15, 2011

Vom Chalant

To vomit and brazenly act as if it were not anything but de rigueur. Throwing up like it ain't no thang. Tossing one's cookies with an air of relaxation. Literally, a combination of vomit and non chalant.
DOOD: So listen, girl, I think you <yak! hwarf!!> lookin' real serious tonight, and I was wonderin' if you would be interested in accompanying me back to my crib.

DOODETTE: That was real Vom Chalant, and all, but I think I'll be fine at my own place.
Vom Chalant by cerveaux September 23, 2006
"Did you see that kid who showed up to prom in a suit of armor? What a Chalana."
Chalana by Son of a Netcast February 5, 2019
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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