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.
by The Real NH April 29, 2020
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1. Extreme concern about an object.
2. Concerned
A chalant person is very concerned about every little detail
by Metz November 5, 2003
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not nonchalant.

Person- A calmed up person who is ready to raise the roof and will call you out for being lame because they're 10 steps ahead of you in the game. Probably hollers and yaks a lot.
Nonchalant: sup, dude...?
Chalant person: I don't sleep, motherfucker!

synonyms: hyphy on fire wild up calmed up crunk firecracker
by Cherokee Thunderbat November 9, 2009
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The opposite of nonchalant. Getting straight to a topic or not beating around the bush.
"Be as chalant as you like"
by samsterhamster118 March 20, 2016
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The opposite to nonchalant. Feeling or appearing irritated and unable to relax. Displaying anxiety, interest and enthusiasm.
by Bigma/pazza December 30, 2019
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"Chalant" is a word illiterate half-wits think of when talking about the positive form of the word nonchalant, which by the way, HAS NO DIRECT POSITIVE FORM.
Guy 1 (talking about his new coworker): "yeah the new guy is pissing me off. Hes way too chalant about his job, always one-uping everyone."

Guy 2: "fuck you."
by Audi0Phil3 January 2, 2019
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Doing smth like you really care about it. The term was introduced by Dream, a well-known Minecraft YouTuber.
That’s the thing about me: I’m very chalant with my editing, and everything I do, I do very chalantly
by 1themouse March 28, 2023
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