[1] Likewise or similarly in other lexica. The headword is third person singular, present indicative active, of fenaki/zw (cf. pi 1419). It must be extracted from somewhere (but not from the quotation given, which contains the related noun fena/kh; cf. phi 194 and note, phi 195). Extant possibilities begin with Demosthenes (25.80 or 31.12).
[2] Theophylact Simocatta, Histories 6.5.16 (with i)sxu/s "strength" of the trickery); on the Avar khan, fooled by a bogus imperial missive into thinking that the arrival of a large Roman fleet was imminent (summer of 588); cf. de Boor (230) and Whitby (166). On the Avars, see generally alpha 18 note.