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Definition of unknown : Not known; not apprehended.

Synonyms:

inexplicable, vague, friendless, unsuspected, extraterrestrial being, unfrequented, outlander, mystical, unidentified, hidden, abstruse, mysterious, terra incognita, anonymous, unusual, unbeknown, transcendent, cabalistic, secret, faraway, untold, dishonorable, isolated, unfamiliar, aloof, knowledge, noncitizen, concealed, outcast, incomprehensible, retired, far, ostracized, exotic, inglorious, chartless, legendary, dark, remote, apart, unfathomed, unsung, known, stranger, unknown quantity, unnoticeable, far-off, unappreciated, desolate, strange, unknown region, undiagnosed, extraterrestrial, nameless, mystic, foreigner, unvalued, undiscovered, recondite, unexplored, unheard-of, distant, unfathomable, unknowable, alien, private, uncharted, antipodal, unmapped, inscrutable, established, unnamed, enigmatical, transcendental, occult, obscure, foreign, unbeknownst, desert, outlandish

Usage examples:

• For Keeko it was a mystery of the unknown. - "The Heart of Unaga", Ridgwell Cullum.
• After all, the rest would have been unknown or forgotten if he had not been a great poet. - "Milton", John Bailey.
• Three came and slipped away into the great unknown before I came- to stay. - "The Road to Understanding", Eleanor H. Porter.