Christ freely taught with words like "evil", "wicked", "hell" and "devil". But these words are now practically extinct, at least in their real context. Words like "sin" and "sinful" are on the endangered list. That is too bad, they represent essential scriptural truths. If Christ had no qualms about such words, we should not either.
Such truths can be used to save souls.
Enos 1:23 And there was nothing save it was exceeding harshness, preaching and prophesying of wars, and contentions, and destructions, and continually reminding them of death, and the duration of eternity, and the judgments and the power of God, and all these things—stirring them up continually to keep them in the fear of the Lord. I say there was nothing short of these things, and exceedingly great plainness of speech, would keep them from going down speedily to destruction. And after this manner do I write concerning them.
But now the real question. If Christ used such words to teach, can Christlike teaching endure without using such words? After all, if we aren't teaching the way he taught, are we teaching in a Christlike way?