[ἐπίορκος] from G1909 and G3727; on oath, i.e. (falsely) a forswearer
Usages throughout the bible
1 Timothy 1:10
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For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, G1965 and if there be any other thing that is contrary to sound doctrine;