Learn how to say Mercurially correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word mercurial:
1subject to sudden or unpredictable changes of mood or mind:
his mercurial temperament
2of or containing the element mercury:
gels containing organic mercurial compounds
3 (Mercurial) of the planet Mercury.
a drug or other compound containing mercury:
for twenty years organic mercurials were the most potent diuretics in clinical use
late Middle English (in sense 3 of the adjective): from Latin mercurialis ‘relating to the god Mercury’, from Mercurius ‘Mercury’. sense 1 of the adjective dates from the mid 17th century