See Rambam on Avos Perek 1 mishna 16 ??”?, ????? ???? ??? ????? ??? ???? ???????? ????, ???? ???? ??? ????? ???????? ??????? ???????? ???? ?????? ????? ????? ?? ???? ??? ????? ?? ????? ??? ????? ???.
Also see the Sefer Nidchey Yisrael by the Chofetz Chaim chapter 20 towards the end where he calls it a ???? and a ??? and if you use ???? ?? any ???? ????? you speak later (including ?????? ????? ?????) will all go to destruction.