1. Not foreseen or foreknown.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• unforseene,
• unforseen,
• unforsceen,
• unfoseen,
• unforesen,
• unforsen,
• unforsean,
• unforescene,
• unforceen,
• inforseen,
• unforseeen,
• unfroseen,
• ynforeseen,
• hnforeseen,
• jnforeseen,
• inforeseen,
• 8nforeseen,
• unforessen,
• unforesene,
• unforcaken

• unperformed,
• unforsaken,
• unpressed,
• unpowered,
• unforbearing,
• unfreeze,
• unpreventable,
• unforceful,
• unpresentable,
• unforested,
• unpretentious,
• uniformise,
• unforced,
• unpretending,
• uniformness,
• unforeseeable,
• uniformed,
• unformed,
• unfrequented,
• unprecedented.

The adjective form of the word "unforeseen" is "unforeseeable".

The plural form of the word "unforeseen" is "unforeseens"

The plural of the "unforeseen" can be the "unforeseen".

The singular form of the word "unforeseen" is "unforeseeable"

The singular of the "unforeseen" can be the "unforeseen".