(Proverbs 15:26 KJV) The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
In comparing the KJV and the NASB we see a different emphasis in the translation. In the NASB it is the “plans” (thoughts KJV) (4284) and “words” (561) that are being evaluated as bad and good. In the KJV it is the thinker and speaker. The KJV uses all nouns and the NASB uses adjectives and nouns. I don’t know enough Hebrew to figure that one out. I would prefer one over the other in an inconsistent manner.
Perhaps that is one way in which the Holy Spirit helps us to apply scripture to our lives. The core meaning is not changed but the insight for today might be different. If I need to be convicted and brought to repentance, focusing on my sin might be best. If I need a simple reminder in way of discipline, the behavior might be the focus.
So? Evil words are evil words. If they come out of my mouth there is a problem whether they are deliberate or accidental. This does not let me make excuses either way.