mysterious

Unsolvable is a related term of mysterious.

As adjectives the difference between unsolvable and mysterious

is that unsolvable is not solvable while mysterious is of unknown origin.

Mysterious is a related term of indecipherable.

As adjectives the difference between mysterious and indecipherable

is that mysterious is of unknown origin while indecipherable is not decipherable; impossible to decode, read, understand or comprehend.

As adjectives the difference between mysterious and interesting

is that mysterious is of unknown origin while interesting is arousing]] or holding the attention or [[interest#noun|interest of someone.

As a verb interesting is

.

As adjectives the difference between mysterious and ancient

is that mysterious is of unknown origin while ancient is having lasted from a remote period; having been of long duration; of great age; very old.

As a noun ancient is

a person who is very old.

As adjectives the difference between mysterious and wellknown

is that mysterious is of unknown origin while wellknown is (nonstandard).

As adjectives the difference between ominous and mysterious

is that ominous is of or pertaining to an omen or to omens; being or exhibiting an omen; significant while mysterious is of unknown origin.

As adjectives the difference between illusionary and mysterious

is that illusionary is illusory; pertaining to an illusion, or of the nature of an illusion while mysterious is of unknown origin.

As a noun clue

is a strand of yarn etc as used to guide one through a labyrinth; something which points the way, a guide.

As a verb clue

is to provide with a clue.

As an adjective mysterious is

of unknown origin.

As adjectives the difference between contagious and mysterious

is that contagious is of a disease, easily transmitted to others while mysterious is of unknown origin.

As adjectives the difference between mysterious and mysterious

is that mysterious is of unknown origin while mysterious is of unknown origin.