0
still
0
tranquil
0
unconcerned
0
undisturbed
0
unexcitable
0
unflappable
0
unhurried
0
unperturbed
0
unshakable
0
unshaken
0
untroubled
0
unworried
-1
apathetic
-1
cool
-1
coolheaded
-1
dull
-1
easy
-1
easygoing
-1
imperturbable
-1
nerveless
10 years ago|1k views|share |citing 
APASmart Define. (2016). hyperactive thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/hyperactive/thesaurus/antonyms
ChicagoSmart Define. 2016. "hyperactive thesaurus" https://smartdefine.org/hyperactive/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2016, hyperactive thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/hyperactive/thesaurus/antonyms>.
MLASmart Define. "hyperactive thesaurus" 1 March 2016. Web. 22 September 2026. <https://smartdefine.org/hyperactive/thesaurus/antonyms>