Usually means: Unpredictable and rapid mood changes.
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We found 6 dictionaries that define the word mercurialness:

General (4 matching dictionaries)
  1. mercurialness: Merriam-Webster
  2. mercurialness: Collins English Dictionary
  3. mercurialness: Wiktionary
  4. mercurialness: Dictionary.com

Business (1 matching dictionary)
  1. mercurialness: Legal dictionary

Medicine (1 matching dictionary)
  1. mercurialness: Merriam-Webster Medical Dictionary

(Note: See mercurial as well.)

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Definitions from Wiktionary (mercurialness)

▸ noun:  Quality of being mercurial; mercuriality.

Similar:
mercuriousness, meretriciousness, temerariousness, mercantility, quicksilverishness, magneticalness, mutability, merciness, mutableness, meroism, more...

Opposite:
consistency, predictability, stability

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Similar:
mercuriousness, meretriciousness, temerariousness, mercantility, quicksilverishness, magneticalness, mutability, merciness, mutableness, meroism, more...

Opposite:
consistency, predictability, stability



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