mercurial

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mercurial

1. of, like, containing, or relating to mercury
2. of, like, or relating to the god or the planet Mercury
3. Med any salt of mercury for use as a medicine
References in classic literature ?
They are expressed in the most plain and simple terms, wherein those people are not mercurial enough to discover above one interpretation: and to write a comment upon any law, is a capital crime.
The equestrian exercises, therefore, in which they are engaged, the nature of the countries they traverse, vast plains and mountains, pure and exhilarating in atmospheric qualities, seem to make them physically and mentally a more lively and mercurial race than the fur traders and trappers of former days, the self-vaunting "men of the north.
Astor was not overconfident of the stability and firm faith of these mercurial beings.