en_tn_lite_do_not_use/2ti/03/13.md

impostors

An imposter is a person who wants other people to think he is someone other, usually more important, than who he is.

will go from bad to worse

"will become even more evil"

leading others and themselves astray

Here, to lead someone astray is a metaphor for persuading someone to believe something that is not true. Alternate translation: "deceiving themselves and others" or "believing lies and teaching lies" (See: rc://en/ta/man/translate/figs-metaphor)