Ful-strang

According to the Old English Dictionary:

-strong, full-strong;

ful-strang

adj. Full strong, very severe or overwhelming; valde sĕvērus vel rĭgĭdus :-- Wæs him eall fulstrang it was all very severe to them, Cd. 218; Th. 278, 23; Sat. 226. Is ðeós þrag fulstrong this moment is very overwhelming, Exon. 72 b; Th. 270, 13; Jul. 464. ful-strang