unacquainted
/ˈʌnəˈkweɪntɪd/adjective
predic.(unacquainted with)
1- having no experience of or familiarity with不熟悉的; 不知道的：
I regret that I am unacquainted with the place.
很遗憾我对这地方不熟悉。
1.1
- (of two or more people) not having met before; not knowing each other（人）不相识的; 未相遇过的。