mercurial
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(s) liable to sudden unpredictable change
- erratic behavior
- fickle weather
- mercurial twists of temperament
- a quicksilver character, cool and willful at one moment, utterly fragile the next
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(a) relating to or under the (astrological) influence of the planet Mercury
- the Mercurial canals
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(a) relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
- more than Mercurial thievishness
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(a) relating to or containing or caused by mercury
- mercurial preparations
- mercurial sore mouth