"an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
is similar to
(of unknown regions) not yet surveyed or investigated
"uncharted seas"
is similar to
unknown to most people
is similar to
(usually used with `to') occurring or existing without the knowledge of
"a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family"
is similar to
eluding diagnosis
"undiagnosed disease"
is similar to
not yet discovered
"undiscovered islands"
is similar to
previously unknown
"a first novel by an unheard of writer"; "developments on an unheard-of scale"
is similar to
not yet identified
"an unidentified species"; "an unidentified witness"
see also
not recognized or admitted
see also
not known or well known
"a name unfamiliar to most"; "be alert at night especially in unfamiliar surroundings"
see also
not bringing honor and glory
"some mute inglorious Milton here may rest"