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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

Chalanie 

Exotic, beautiful. Has artistic qualities. A great listener, and is willing to give good feedback if willing to hear it. Opinionated, not afraid to validate her opinions. Fun, nice, outgoing, spontaneous, cultural, analytical, great friend.
If you haven't met Chalanie, your life is missing something!

Wow, Chalanie gave me some great advice just now...
Chalanie by 4946 May 6, 2009
1. Extreme concern about an object.
2. Concerned
A chalant person is very concerned about every little detail
chalant by Metz November 4, 2003

Chabanterlax

Derived from: banter- conversation that is witty

Chilax: to relax , usually done with other people

The act of chabanterlax is relaxing in other peoples company whilst having a witty/playful conversation
Friend : what shall we do tonight?
Other friend :Chabanterlax at my house?
Chabanterlax by E'belle October 29, 2009

chalanfet 

When you get this very very bad feeling in your stomach and feel like you’re going to have explosive diarrhea while sneezing.
“Oh dude, I’m chalanfet right now.”
chalanfet by DeluxeEdition June 14, 2021

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