Middle English word forneh comes from Old English nēah, Old English for-, Old English fornēah, and later Old English forneah (Very nearly, nigh, nearly, almost, about.)

Detailed word origin of forneh

Dictionary entry	Language	Definition
nēah	Old English (ang)
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.
fornēah	Old English (ang)
forneah	Old English (ang)	Very nearly, nigh, nearly, almost, about.
forneah	Middle English (enm)

Words with the same origin as forneh