dubbhati : [dubh + a] is treacherous or unfaithful; plots against.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Dubbhati (& dūbhati) [Sk. dabhnoti cp. J.P.T.S. 1889, 204: dabh (dambh), pp. dabdha; idg. *dhebh, cp. Gr. a)te/mbw to deceive. Cp. also Sk druh (so Kern, Toev. p. 11, s. v. padubbhati). See also dahara & dūbha, dūbhaka, dūbhi] to injure, hurt, deceive; to be hostile to, plot or sin against (either w. dat. Jv.245; vi.491, or w. loc. J i.267; iii.212) S i.85 (ppr. adubbhanto), 225; It 86 (dubbhe=dusseyya Com.)=Vin ii.203 (where dubbho); Th 1, 1129; J ii.125;iv.261; v.487, 503. -- ppr. also dūbhato J iv.261; ger. dubbhitvā J iv.79; grd. dubbheyya (v. l. dūbheyya) to be punished J v.71. Cp. pa˚.

Pali-English Dictionary, TW Rhys Davids, William Stede,