mysterious

As adjectives the difference between unique and mysterious

is that unique is (not comparable) being the only one of its kind; unequaled, unparalleled or unmatched while mysterious is of unknown origin.

As a noun unique

is a thing without a like; something unequalled or unparallelled.

Mysterious is a related term of underhand.

As adjectives the difference between mysterious and underhand

is that mysterious is of unknown origin while underhand is secret; clandestine.

As an adverb underhand is

with an underhand movement.

Unrevealed is a related term of mysterious.

As adjectives the difference between unrevealed and mysterious

is that unrevealed is not revealed; hidden; secret while mysterious is of unknown origin.

As an adjective mysterious

is of unknown origin.

As a noun mystique is

an aura of heightened interest, meaning or mystery surrounding a person or thing.

As an adjective mysterious is

of unknown origin.

As an adjective mysterious is

of unknown origin.

As adjectives the difference between incomprehensible and mysterious

is that incomprehensible is impossible or very difficult to understand while mysterious is of unknown origin.

As adjectives the difference between mysterious and elusive

is that mysterious is of unknown origin while elusive is evading capture, comprehension or remembrance.

Unseen is a related term of mysterious.

As adjectives the difference between unseen and mysterious

is that unseen is not seen or discovered while mysterious is of unknown origin.

As a verb unseen

is .

As a noun unseen

is an examination involving material not previously seen or studied.

Unexplainable is a related term of mysterious.

As adjectives the difference between unexplainable and mysterious

is that unexplainable is that cannot be explained; inexplicable while mysterious is of unknown origin.