unknown

As adjectives the difference between unwitting and unknown

is that unwitting is unaware or uninformed while unknown is not known; unidentified; not well known.

As a noun unknown is

(algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

Problematic is a synonym of unknown.

As adjectives the difference between problematic and unknown

is that problematic is posing a problem; difficult to overcome or solve while unknown is not known; unidentified; not well known.

As nouns the difference between problematic and unknown

is that problematic is (chiefly|in the plural) a problem or difficulty in a particular field of study while unknown is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

Unknown is a related term of humble.

As adjectives the difference between unknown and humble

is that unknown is not known; unidentified; not well known while humble is near the ground; not high or lofty; not pretentious or magnificent; unpretending; unassuming; as, a humble cottage or humble can be hornless.

As a noun unknown

is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As a verb humble is

to bring low; to reduce the power, independence, or exaltation of; to lower; to abase; to humiliate.

Misty is a related term of unknown.

As a proper noun misty

is from the adjective "misty", reasonably popular in the 1970s and the 1980s.

As an adjective unknown is

not known; unidentified; not well known.

As a noun unknown is

(algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

Abstruse is a related term of unknown.

As adjectives the difference between abstruse and unknown

is that abstruse is (obsolete) concealed or hidden out of the way; secret while unknown is not known; unidentified; not well known.

As a noun unknown is

(algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As adjectives the difference between unknown and untangled

is that unknown is not known; unidentified; not well known while untangled is not tangled.

As a noun unknown

is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As a verb untangled is

(untangle).

As adjectives the difference between unknown and unanimous

is that unknown is not known; unidentified; not well known while unanimous is based on unanimity, assent or agreement.

As a noun unknown

is a variable (usually x, y or z) whose value is to be found.

As adjectives the difference between private and unknown

is that private is belonging to, concerning, or accessible only to an individual person or a specific group while unknown is not known; unidentified; not well known.

As nouns the difference between private and unknown

is that private is the lowest rank of the army while unknown is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As adjectives the difference between sexual and unknown

is that sexual is of or relating to having sex, sexual acts and sexual reproduction while unknown is not known; unidentified; not well known.

As nouns the difference between sexual and unknown

is that sexual is (biology) a species which reproduces by sexual rather than asexual reproduction, or a member of such a species while unknown is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As nouns the difference between unknown and difference

is that unknown is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found while difference is difference.

As an adjective unknown

is not known; unidentified; not well known.