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hyperexcitable
hyperexcitable adj. 
/ˌhʌɪpərɛkˈsʌɪtəbl/, /ˌhaɪpərˌɛkˈsaɪdəb(ə)l/
Brit. /ˌhʌɪpərᵻkˈsʌɪtəbl/
, /ˌhʌɪpərᵻkˈsʌɪtəbl//ˌhʌɪpərɛkˈsʌɪtəbl/U.S. /ˌhaɪpərɪkˈsaɪdəb(ə)l/
, /ˌhaɪpərɪkˈsaɪdəb(ə)l//ˌhaɪpərˌɛkˈsaɪdəb(ə)l/Π
1886 Lancet 13 Mar. 485/2 Even normal mental impulses may cause undue motorial demonstrations if the spinal centres are hyper-excitable, as is seen in strychnine poisoning, hysteria, &c.
1972 Nature 10 Mar. 74/1 The animal became hyperexcitable with exaggerated startle response.
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