unexcitable
adjective
un·ex·cit·able
ˌən-ik-ˈsī-tə-bəl
: not excitable: such as
a
: incapable of being stirred or energized
an unexcitable temperament
He always seemed to weigh his words, unexcitable, calm, measured …—Craig Raine
b
: not responsive to stimuli
unexcitable cells
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Merriam-Webster unabridged
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