What is the opposite of insouciant?

Need antonyms for insouciant? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of showing a casual lack of concern
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Adjective
Opposite of cheerfully unconcerned about the future or things in general
Adjective
Opposite of having a relaxed, friendly, or unofficial style, manner, or nature
“You will abide by my strict rules to maintain absolute cleanliness and hygiene in my household!”
Adjective
(passionate) Opposite of done or acting in an indifferent or apathetic manner
“He is a passionate defender of the noble art of genre film-making, something he feels was ruined by spendthrift Hollywood studios.”
Adjective
(passionate) Opposite of done or acting in an indifferent or apathetic manner
“He displays a passionate disposition to saving endangered wildlife.”
Adjective
Opposite of treating serious issues with inappropriate humor
“I was being sincere when I accepted your challenge to a boxing match.”
Adjective
Opposite of showing haughty disregard
Adjective
Opposite of even-tempered and reasonable
Adjective
Opposite of offensively nonchalant or cool in manner
Adjective
Opposite of light-hearted and carefree
Adjective
Opposite of showing no concern or interest
Adjective
Opposite of not easily irritated or flustered
Adjective
Opposite of casual or relaxed in nature
“Around strangers, he would be restrained when expressing his true opinions so as not to offend anyone.”
Adjective
Opposite of not showing a proper sense of care or responsibility
“I consider us to be responsible people because we fill our recycling box to capacity every week, and put it out for collection.”
Adjective
Opposite of carried out without real interest, feeling, or concern
“They had already gone through a very thorough review, but now they have to be reviewed again.”
Adjective
Opposite of appearing relaxed, informal, and cheerily brisk
Adjective
Opposite of lightheartedly silly or excitable
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