Plenty of articles out there trying to justify that the Bible speaks against curse/cuss words. I'm not talking about making profane statements or speeches which are made up of a bunch of words. I'm referring to singular word like: Fuck, Shit, Damn, etc. Of course, in other languages, they have their own set of "accepted" cuss words.
Another term for this is "dirty words".
I don't think the Bible ever teaches against this. Profanity, swearing, yes, but not specific words that somehow the majority of society has collectively accepted as "dirty words". These "dirty words" are not vain, they have meanings assigned to them. Fuck means having intercourse. Saying "having intercourse" is acceptable, but not the word "Fuck" in the social norm. Why is that? They both designate the same meaning.
So instead of shit, kids are taught to say "poo" instead. "Making love" instead of "fuck". Of course, one may even get so uncomfortable saying any of these culturally accepted substitutions and turn the whole language very general: "Going to toilet/ Taking number 2" instead of saying poo, "sleeping together" instead of fuck. The less specific the better it is. Hence, sacrificing details in speech. I think this is treading on sinful ground as well - not making clear statements.
True, there are times and places we don't just say anything we want, even if they are the truth, just like we would hide our nudity in public. So I'm not talking about such cases. Yet, often times, we hesitate in our speech to find a less offensive terms despite of non-offensive intention. I think it is not necessary.
That doesn't mean that we should now start using these "dirty" words. We should speak truthful and contently. Some people use these "dirty" words sinless, I must say, because of their own background, the kind of people they grew up with, but their hearts are purer than those who even refused to use the word "poo". Some of us have trained ourselves to use our own substitute words or languages, that is fine too, as long as we do not take those "dirty" words as if they have some bewitching essence (Idolatry/lies) nor having some unclean property (lies/calling God's creation unclean). It is the heart that is unclean, not the words. Words are just words. How we use them matters as they communicate our hearts, but the culprit would always be us, not the words themselves. So for the sake of others, we do control our speech and the choice of words we use.
Again, using of the words in itself is never a sin, just like being strong is not a sin, it is the choice of words out of our hearts and motives that would result in sin.
As a conclusion, I would not use some words if they would cause my brothers to sin, as they lack faith. I would not be sinning by merely using these words.