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quicksilver
Adjectivequicksilver has 1 sense
erratic, fickle, mercurial, quicksilver - 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" Antonym:unchangeable (indirect, via changeable)