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 casually calm and relaxed
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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 not bound by rigid standards
“You will abide by my strict rules to maintain absolute cleanliness and hygiene in my household!”
Adjective
Opposite of ungraciously or 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 influenced by strong emotion, and so able to be rational and impartial
Adjective
Opposite of of having a good-natured or casual personality
“Any friendly aspect or unfriendly connection between these two is then said to reflect upon the relationship of the lovers.”
Adjective
Opposite of not easily irritated
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
(of speech, expression, or action) Opposite of frank or unrestrained
“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 moving, acting, or taking place without haste or urgency
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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