adjective
an adjective is a word that describes or modifies a noun or pronoun. In this case, 'unfamiliar' describes something that is not known or recognized.
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The new employee found the company's software system to be unfamiliar at first.
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I feel a bit lost in this unfamiliar neighborhood.
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I'm totally out of my element in this unfamiliar situation.
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The concept of time travel is still unfamiliar to most people.