Fláh

According to the Old English Dictionary:

fláh

Substitute : Hostile, fell, cruel :-- Flách infestus, Wrt. Voc. ii. no, 78. Þonne þæt gecnáweð fláh feónd gemáh . . . hé him feorgbona þurh slíðen searo weorþeð, Wal. 39. Fláh máh flíteþ, Reim. 62. Wið fláne feónd werigean, Exod. 237. [If the word agrees in meaning as well as in form with Icel. flár (hygyja flátt to think false) in one or two of the passages it might be translated by treacherous, crafty.] flah