[for me anyway] our enemies are those that curse us, and those that hate us, and those who despitefully use and persecute us, according to the Lord Jesus Christ. As for our tongue, it can be as an enemy if we have not denied (disowned) ourselves (our own will); but then we would even be following the Lord. As for (1 John 2:16) it refers to nothing concerning so-called "dumb friends".
"For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world."