The antonyms for the word "inerts" are active, energetic, dynamic, lively, vigorous, animated and lively. These words convey the opposite meaning of inactivity, sluggishness, and lethargy. Active refers to someone or something that is busy, engaged in physical or mental activity, while energetic implies a high level of enthusiasm, vigor and drive. Dynamic and lively both suggest movement, liveliness, and a sense of excitement or dynamism. Vigorous pertains to someone or something that is robust, strong, and full of energy, while animated is used to describe lively, spirited behavior or appearance. So, instead of being inert, one can be any of these antonyms and remain lively and productive.