Syn-wyrcende

According to the Old English Dictionary:

syn-wyrcende

working sin, sinning, working iniquity:--Synwyrcende (the devil), Elen. Kmbl. 1884; El. 944. Synwyrcende (operantes iniquitatem), ða ðe unrihtes ǽghwær þenceaþ, Ps. Th. 140, 11. Ansýna synn-wyrcendra facies peccatorum, 81, 2. syn-wyrcende