Frivols refer to the act of doing something unimportant, fun and frivolous. The antonyms of "frivols" are words that are related to serious and important work. Such words include "accomplish, achieve, labor, toil, exertion, hard work, effort, industry, seriousness, and weightiness". Engaging in meaningful work helps individuals to achieve their goals in life, which in turn brings about satisfaction and fulfillment. It is essential to maintain a balance between having fun and being productive with meaningful activities that help build character and lead to personal growth. In conclusion, the antonyms of frivols denote essential, constructive, and purposeful activities that bring meaning to our lives.