Un-læt

According to the Old English Dictionary:

un-læt

adj. Not slow, quick, ready, active :-- Unlæt non pigra, Wrt. Voc. ii. 61, 61. Wíga, unlæt láces (death), Exon. Th. 164, 5; Gú. 1007. Hræd and unlæt, 436, 9; Rä. 54, 11. un-læt