en_tn_condensed/2th/02/10.md

with all deceit of unrighteousness

This person will use every sort of evil to deceive people to believe in him instead of God.

These things will be for those who are perishing

This man who is given power by Satan will deceive everyone who did not believe in Jesus.

who are perishing

Here "perishing" has the concept of everlasting or eternal destruction.