πιστῶς
From LSJ
Πάντα οὖν ὅσα ἐὰν θέλητε ἵνα ποιῶσιν ὑμῖν οἱ ἄνθρωποι, οὕτως καὶ ὑμεῖς ποιεῖτε αὐτοῖς· οὗτος γάρ ἐστιν ὁ νόμος καὶ οἱ προφῆται → Therefore as many things as you would like people to do for you, do also the same for them: that is the Torah, that is the prophets! (Matthew 7:12)
French (Bailly abrégé)
adv.
1 fidèlement;
2 de bonne foi;
3 d’une manière digne de foi;
Sp. πιστότατα.
Étymologie: πιστός¹.
Russian (Dvoretsky)
πιστῶς:
1) верно, тж. честно, добросовестно (πράσσειν Dem.);
2) убедительно, достоверно (φαίνεσθαι Plat.).