unknown (adjective) unknown: obscure, mysterious
Sinonime: X,
alien,
anonymous,
concealed,
dark,
desolate,
distant,
exotic,
far, far-off, faraway,
foreign,
hidden,
humble, incog,
incognito, little known, nameless,
new,
remote,
secret, so-and-so,
strange, such-and-such, unapprehended, unascertained, uncelebrated, uncharted, undiscovered, undistinguished, unexplained, unexplored,
unfamiliar, unheard-of, unidentified, unnamed, unnoted, unperceived, unrecognized, unrenowned, unrevealed, unsung, untold
Antonime: familiar, identified,
known