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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
Related Words
1. Extreme concern about an object.
2. Concerned
A chalant person is very concerned about every little detail
chalant by Metz November 4, 2003
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