Definition of unexcitable
: 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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Time Traveler for unexcitable
The first known use of unexcitable was in 1839
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