Question

mercurial His mother's always mercurial temper became even more unpredictable, to the point where the slightest thing would trigger a violent fit. mərˈkjʊriəl

Accepted Answer

Having rapid and unpredictable changes of mood. The god Mercury, with his winged cap and sandals, was the very symbol of speed, and the planet Mercury was named for him by the Romans because it is the fastest-moving of the planets. His name was also given to the liquid silver metal that skitters around on a surface so quickly and unpredictably. And the word mercurial seems to have come from the metal, rather than directly from the god (or an astrologer's view of the planet's influence). Mercurial people are usually bright but impulsive and changeable (and sometimes a bit unstable)

word	mercurial
definition	Having rapid and unpredictable changes of mood.
eg_sentence	His mother's always mercurial temper became even more unpredictable, to the point where the slightest thing would trigger a violent fit.
explanation	The god Mercury, with his winged cap and sandals, was the very symbol of speed, and the planet Mercury was named for him by the Romans because it is the fastest-moving of the planets. His name was also given to the liquid silver metal that skitters around on a surface so quickly and unpredictably. And the word mercurial seems to have come from the metal, rather than directly from the god (or an astrologer's view of the planet's influence). Mercurial people are usually bright but impulsive and changeable (and sometimes a bit unstable)
IPA	mərˈkjʊriəl

Mercurial God Rapid Unpredictable Mood Mother's Temper Point