Unfamiliar things are unknown or unexplored. On your first day at a new school, every single face you see is unfamiliar.

Traveling in an unfamiliar city is easier with a map or a GPS, and meeting the unfamiliar people who live there is easier if you speak at least a few words of their language. Some people love eating unfamiliar food — things they've never tasted before — while others aren't fond of it. When something (or someone) is familiar, it's known to you — the word shares a Latin root with family. Add the "not" prefix un-, and you've got unfamiliar.

Definitions of unfamiliar
  1. adjective
    not known or well known
    “a name unfamiliar to most”
    “be alert at night especially in unfamiliar surroundings”
    strange, unknown
    not known before
    unacquainted, unacquainted with, unfamiliar with
    having little or no knowledge of
    foreign, strange
    relating to or originating in or characteristic of another place or part of the world
    not known
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    well known or easily recognized
    having fair knowledge of
    much trodden and worn smooth or bare
    long-familiar, well-known
    frequently experienced; known closely or intimately
    (used for emphasis) very familiar
    apprehended with certainty
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