Definition of "nervy"

It takes a nervy man to promulgate such stuff, and Ted Nelson has made a career out of being nervy.

1988 April, David Gans, “Ted Nelson And The Ultimate Information Machine”, in MicroTimes, page 55

Blackpool continue to thrive on the adrenalin rush of the end-of-season shoot-out and are heading for a second Wembley date in two years after negotiating a nervy path past Birmingham.

2012 May 9, John Percy, “Birmingham City 2 Blackpool 2 (2-3 on agg): match report”, in the Telegraph‎

And, for those simple times, his garments were / A chieftain-king's: beneath his breast, half bare, / Was hung a silver bugle, and between / His nervy knees there lay a boar-spear keen […]

1818, John Keats, “Book I”, in Endymion: A Poetic Romance, London: […] [T. Miller] for Taylor and Hessey, […], page 1