A false sense of unfamiliarity in a situation. Literally means “never lived” or “never experienced” in French.
Example: An infantryman under intense bombardment for the third time in a week suddenly gets the strange feeling he’s never held a rifle before.
Grinnell, R. (2008). Jamais Vécu. Psych Central. Retrieved on June 3, 2015, from http://psychcentral.com/encyclopedia/2008/jamais-vecu/