Not acquainted, unfamiliar (with someone or something).
The Romains vnacquainted with such perills, wold not endure the hasard of the siege.
Not usual; unfamiliar; strange.
Who when she saw Duessa sunny bright, Adornd with gold and iewels shining cleare, She greatly grew amazed at the sight, And th’vnacquainted light began to feare:
From un- + acquainted.
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