unfamiliarity
🇺🇸
/ˌʌnfəˌmɪliˈærəti/
🇬🇧
/ˌʌnfəˌmɪliˈærəti/
When you don't know or recognize someone or something.
The unfamiliarity of the new city made her feel a bit lost.
When you have no knowledge or experience with something.
His unfamiliarity with the software made it hard for him to work efficiently.