Select the most appropriate antonym of the given word. Familiar

The most appropriate antonym of the word familiar is strange.

• Familiar means "well-known or acquainted."
• Strange means "not familiar; unfamiliar or new."

The other words do not have the same meaning as familiar, so they are not its antonyms.

• Usual means "commonly or ordinarily encountered or done."
• Common means "shared by many or occurring often; widespread."
• Known means "having been learned or perceived before."