en_tn/1ti/04/02.md

in lying hypocrisy

This can be stated as a separate sentence. Alternate translation: "These people will be hypocrites and speak lies"

their own consciences having been seared

Possible meanings are 1) Paul is speaking of people who can no longer tell that they are doing wrong as if their minds were ruined. He speaks of the mind being ruined as if the mind were skin that someone had burned with a hot iron. Or 2) Paul is speaking of these people as if Satan had put a mark on these people with a hot iron to indicate that they belong to him. (See: rc://en/ta/man/translate/figs-metaphor)

seared

touched with a hot object until it burns brown or black