MERCURIAL = (adjective) 1. containing or being somehow related to mercury; 2. having a temperamental, active, or unpredictable personality; 3. quick, lively, and shrewd, like the god Mercury

Synonyms: erratic, changeable, fickle, volatile, unpredictable, fluctuating, temperamental, moody, lively, quick

Antonyms: constant, invariable, steady, stable, even

Examples:
- I wanted a mercurial thermometer but I got a digital one.
- The comedian relied on his mercurial wit, not rehearsed jokes, to entertain his audience.
- Lisa is a bit unpredictable with her mercurial mood swings.
- His mood is so mercurial that we never know how heʼs going to react to anything
NONCHALANT = (adjective) casual and unconcerned

Synonyms: casual, blasé, indifferent, unconcerned, unflappable, apathetic

Antonyms: worried, concerned

Examples:
- Surprisingly, when John was told he won the contest, he was very nonchalant, and didn’t seem that excited.
- Even though Marc was nervous when he asked her out, he tried to appear nonchalant about it.  
- Once on a safari we found 10 lions walking nonchalantly across an open field.

 

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