Berean Standard Bible (BSB)
keeping a clear conscience, so that those who slander you may be put to shame by your good behavior in Christ.
World English Bible (WEB)
having a good conscience; that, while you are spoken against as evildoers, they may be disappointed who curse your good way of life in Christ.
Strong's King James
Having{G2192}{(G5723)} a good{G18} conscience{G4893}; that{G2443}, whereas{G1722}{G3739} they speak evil{G2635}{(G5725)} of you{G5216}, as{G5613} of evildoers{G2555}, they may be ashamed{G2617}{(G5686)} that falsely accuse{G1908}{(G5723)} your{G5216} good{G18} conversation{G391} in{G1722} Christ{G5547}.
The F.O.G *
(16) having a good conscience, so that in that which they slander you, threatening your good way of life in HaMashiach, they will be humiliated.
The F.O.G Message *
Young's Literal Translation
having a good conscience, that in that in which they speak against you as evil-doers, they may be ashamed who are traducing your good behaviour in Christ;