1 Timothy 4:2

through the insincerity of liars whose consciences are seared,

Such teachings come through hypocritical liars, whose consciences have been seared as with a hot iron.

through the hypocrisy of liars whose consciences are seared.

These people are hypocrites and liars, and their consciences are dead.

by the hypocrisy of liars, who are seared in their own conscience,

Speaking lies in hypocrisy; having their conscience seared with a hot iron;