What is the opposite of nonchalant?

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

Adjective
Opposite of indifferent, unconcerned, or behaving as if detached
“They were young and enthusiastic, ready to share their music and to try to make a living doing so.”
Adjective
Opposite of casually calm and relaxed
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“There are physiological repercussions from constantly being anxious about calls from creditors or a visit from the repo man.”
Adjective
Opposite of easygoing in temperament
“Gabriel did not need a weapon to appear intimidating as his size and unapproachable demeanor accomplished that well enough.”
Adjective
(attributive) Opposite of feeling or exuding self-assurance
“They were insecure young men, who were led astray by a charismatic self-proclaimed prophet.”
Adjective
Opposite of done or acting in an indifferent or apathetic manner
“He displays a passionate disposition to saving endangered wildlife.”
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
Opposite of offensively nonchalant or cool in manner
Adjective
Opposite of cheerfully unconcerned about the future
Adjective
Opposite of light-hearted and casual
Adjective
Opposite of even-tempered and reasonable
Adjective
Opposite of not showing a proper sense of care or responsibility
Adjective
Opposite of confident or self-assured
Adjective
Opposite of laid back and unhurried
“The frenetic action and strategic nuances of this sport make it exhilarating, yet fascinating.”
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 appearing relaxed, informal, and cheerily brisk
Adjective
Opposite of not allied with any particular nation, or to any side in a dispute
Adjective
(of a remark) Opposite of expressed in a casual or understated way
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