argos - inactive, ie. unemployed; (by implication) lazy, useless: - barren, idle, slow
(Abingdon's Strong's Exhaustive Concordance of The Bible)
Everyday we use words. There is not a day that goes by that we don't utter at least one or two words; even if it is only to say,"I'm sick". We have a storehouse of words from which we draw upon. Sometimes we are lazy and grab the first word that comes to mind without considering the ramifications; we want to get our point across. There might be a time pressure in that we have to respond quickly. Sometimes we don't really care about the matter before us so we answer in a way that doesn't bring life to the hearer. In doing this we have robbed not only our hearers, but ourselves of a blessing. When we choose our words with care they will not be "barren".
"From the fruit of his lips a man enjoys good things, but the unfaithful have a craving for violence. He who guards his lips guards his life; but he who speaks rashly will come to ruin."(Proverbs 13: 2, 3 NIV)
"From the fruit of his mouth a man's stomach is filled; with the harvest from his lips he is satisfied. The tongue has the power of life and death, and those who love it will eat its fruit." (Proverbs 18: 20, 21 NIV)