ἀκοντιστικός
From LSJ
τοῖς οἰκείοις βουλεύμασιν ἁλίσκεσθαι → hoist by one's own petard, hoist with one's own petard, hoist on one's own petard, hoisted by one's own petard, be hoist with one's own petard
English (LSJ)
ή, όν,
A skilled in throwing the dart, X.Cyr.7.5.63: Sup., ib.6.2.4; -κά, τά, art of throwing the dart, Pl.Thg.126b; -κή, ἡ, Ael.Tact. Praef., Arr.Tact.Praef. Adv. -κῶς Poll.3.151.