δολερός
From LSJ
ξένος ὢν ἀκολούθει τοῖς ἐπιχωρίοις νόμοις → as a foreigner, follow the laws of that country | when in Rome, do as the Romans do
English (LSJ)
ά, όν, (δόλος)
A deceitful, treacherous, νόος Hdt.2.151; ἄνθρωποι, εἵματα, Id.3.22; φρήν S.Ph.1112 (lyr.), cf. X.Cyr.1.6.27, Ant.Lib.29.3; δολερὸν πέφυκεν ἄνθρωπος Arr.An.4.5.1; δ. ἔρως Pl. Smp.205d. Adv. -ρῶς Ph.2.314, J.AJ14.13.6, Poll.3.132.