Main entry: frivolous
Definition: not serious in content or attitude or behavior
Usage: a frivolous novel; a frivolous remark; a frivolous young woman
Antonyms: serious
Definition: concerned with work or important matters rather than play or trivialities
Definition: absence of light or illumination
Antonyms: dark
Definition: devoid of or deficient in light or brightness; shadowed or black
Antonyms: dark
Definition: (used of color) having a dark hue
Antonyms: heavy
Definition: of comparatively great physical weight or density
Antonyms: heavy
Definition: marked by great psychological weight; weighted down especially with sadness or troubles or weariness
Antonyms: heavy
Definition: unusually great in degree or quantity or number
Antonyms: heavy
Definition: (physics, chemistry) being or containing an isotope with greater than average atomic mass or weight
Antonyms: heavy
Definition: of great intensity or power or force
Antonyms: heavy
Definition: of the military or industry; using (or being) the heaviest and most powerful armaments or weapons or equipment
Antonyms: run
Definition: be operating, running or functioning
Antonyms: work
Definition: exert oneself by doing mental or physical work for a purpose or out of necessity
Antonyms: busy
Definition: actively or fully engaged or occupied