unforeknown

As a noun terms

is .

As an adjective unforeknown is

not known in advance.

As adjectives the difference between known and unforeknown

is that known is identified as a specific type; renowned, famous while unforeknown is not known in advance.

As a verb known

is past participle of lang=en.

As a noun known

is in algebra, a variable or constant whose value is already determined.