over-excitability
/ˌəʊv(ə)rɪkˌsʌɪtəˈbɪlɪti/ /ˌəʊv(ə)rɛkˌsʌɪtəˈbɪlɪti/noun
The quality or condition of being over-excitable.
Origin
Mid 19th century; earliest use found in Robert Browning (1812–1889), poet. From over- + excitability, after over-excitable.