Question

read the thesaurus and sentence.
nonchalant (adj): unconcerned, indifferent
although it seemed likely that there would be a negative reaction, the mayor appeared nonchalant when making the announcement.
what word can replace nonchalant without changing the meaning of the sentence above?
untroubled
unhappy
easygoing
smooth

Explanation:

The thesaurus defines "nonchalant" as unconcerned or indifferent. We need a synonym that fits the context of the mayor not being bothered by a likely negative reaction. "Untroubled" means not worried or disturbed, which matches the meaning of nonchalant here. "Unhappy" is the opposite, "easygoing" refers to a general relaxed nature rather than indifference to a specific reaction, and "smooth" does not relate to the emotional state described.

Answer:

untroubled