Middle English word forseen comes from Old English fore-, Old English for-, Old English sēon, Old English seon (To see.)

Detailed word origin of forseen

Dictionary entry	Language	Definition
fore-	Old English (ang)	Before, in front of, pro-. First, prime, occupying a prominent position. Very, supremely, foremost.
for-	Old English (ang)	Forming verbs from verbs with various senses especially ‘wrongly, away from, astray, abstention, prohibition, perversion, destruction’. Used to create intensified adjectives and verbs from other adjectives and verbs, with the sense of completely or fully. Compare Modern English use of up. Very.
sēon	Old English (ang)
seon	Old English (ang)	To see.
forsēon	Old English (ang)
foresēon	Old English (ang)
foreseon	Old English (ang)	To see beforehand; foresee, provide.
forseon	Old English (ang)	To overlook.. To reject, neglect, renounce. To scorn, be ashamed of, despise; see as bad or wrong.
foreseen	Middle English (enm)

Words with the same origin as forseen