unfamiliarity

noun

Etymology: From un- + familiarity.

1. Lack of familiarity; ignorance or inexperience.

   “Due to my unfamiliarity with the library's catalog system, it took several hours to find the book.”

   “He let Sandy stand for a minute and then took the saddle off. Several more of these saddlings and unsaddlings followed. Then finally the saddle was cinched. Again Sandy repeated his pattern of calming down after the first unfamiliarity of a new experience had worn off. […] Before long Sandy accepted the saddle as if he’d been born with one on his back.”