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Definition of unacquainted : 1. Not acquainted.
2. Not usual; unfamiliar; strange.

Synonyms:

uninformed, unknowing, ignorant, innocent, unconscious, in the dark, unenlightened, unaware, knowledge, unacquainted with, oblivious, unfamiliar, unfamiliar with, unwitting

not intimate, unknown, aloof, not introduced, not on speaking terms, incommunicado, withdrawn, isolated, strange, out of touch, secluded, apart

Usage examples:

• While looking for some poles for our hut, I saw on the branch of a tree overhanging the water, gazing down upon us, a hideous monster, fully five feet long, which at the first glance I took to be a species of alligator with which I was unacquainted. - "On the Banks of the Amazon", W.H.G. Kingston.
• To any one unacquainted with foreign ways, a complete rupture of international peace and relations seemed imminent. - "Flamsted quarries", Mary E. Waller.
• As he knew who she was when he received her from the chaste arms of Barras, and is not unacquainted with her subsequent intrigues particularly during his stay in Egypt- policy may influence a behaviour which has some resemblance to esteem. - "The Project Gutenberg Memoirs of Napoleon Bonaparte", Bourrienne, Constant, and Stewarton.