flinchy

cristina is flinchy. She reacts to the smallest movements by jumping and dodging for no reason.

Cristina is flinchy.

Flinchiness

Similar to words like “Happiness” or “Edginess”, The suffix "-iness" mainly that indicate a state or condition. So in this case the word “Flinchiness” means that when someone is being flinchy.

“She thought her flinchiness would go away by the time summer came”

“He was filled with a lot of flinchiness the last time I tried talking to him”