overstrung
adjective
over·strung ˌō-vər-ˈstrəŋ 
: too highly strung : too sensitive
Example Sentences
Recent Examples on the Web In general, Alfa Romeo has produced a sedan that drives far lighter and more athletically than expected, without feeling overstrung. 
Hannah Elliott, Bloomberg.com, 22 Jan. 2018
Hannah Elliott, Bloomberg.com, 22 Jan. 2018 Word History
First Known Use
1810, in the meaning defined above