Answer: EXCITABLE

AnswerCrossword Clue
EXCITABLEHot-tempered
EXCITABLETightly wound
EXCITABLEHigh-strung
EXCITABLEEasily enthused
excitable(of tissue or a cell) Responsive to stimulation
excitableable to be excited
excitableResponding rather too readily to something new or stimulating; too easily excited