Definition for Mercurial:

• Sprightly; vivacious; containing mercury.

Synonyms for Mercurial:

• adj.

  •agile (adjective)
  • fleet,
  • sharp,
  • spry,
  • quick,
  • swift,
  • winged,
  • vivacious,
  • clever,
  • alert,
  • prompt,
  • brisk,
  • frisky.
  •capricious (adjective)
  • flaky,
  • changeful,
  • yo-yo,
  • quirky,
  • flighty,
  • fanciful,
  • wayward,
  • fitful,
  • crotchety,
  • mutable.
  •changeable (adjective)
  • shifting,
  • precarious,
  • adaptable,
  • versatile,
  • modifiable,
  • flexible,
  • indecisive,
  • inconstant,
  • alterable,
  • movable,
  • wavering,
  • varying,
  • unsteady,
  • transformable,
  • skittish,
  • vagrant,
  • protean,
  • reformable,
  • irresolute,
  • Transposable,
  • transitional,
  • vacillating,
  • adjustable,
  • restless,
  • unsettled,
  • unreliable,
  • Vicissitudinous,
  • spasmodic,
  • ever-changing,
  • convertible,
  • irresponsible.
  •erratic (adjective)
  • desultory,
  • dubious,
  • eccentric,
  • roving,
  • nomadic,
  • rambling,
  • planetary.
  •excitable (adjective)
  • high-strung,
  • emotional,
  • edgy,
  • hasty,
  • hysterical,
  • testy,
  • touchy,
  • impetuous,
  • nervous,
  • quick-tempered,
  • reckless,
  • fidgety,
  • uncontrolled,
  • excitable,
  • galvanic.
  •fickle (adjective)
  • frivolous,
  • coquettish,
  • quicksilver,
  • unfaithful,
  • faithless.
  •fleet (adjective)
  • expeditious,
  • speedy,
  • nimble,
  • breakneck.
  •flighty (adjective)
  • scatterbrained,
  • wild,
  • giddy.
  •fluid (adjective)
  • indefinite.
  •mercurial (adjective)
  • irrepressible,
  • gaga,
  • fluctuating,
  • lighthearted,
  • gay,
  • up-and-down,
  • elastic,
  • lubricious,
  • expansive,
  • impulsive,
  • mad,
  • resilient,
  • spirited,
  • mobile,
  • effervescent,
  • blowing hot and cold,
  • buoyant,
  • sprightly,
  • irregular.

• n.

  •
  • animated,
  • active,
  • lively,
  • energetic,
  • alive.
  •
  • whimsical,
  • temperamental,
  • schizophrenic,
  • fantastical,
  • freakish,
  • fantastic.

Antonyms for Mercurial:

• adj.

  • agile
    clumsy, stiff, brittle.
  • capricious
    steady, steadfast, staid, dependable, sensible, constant.
  • changeable
    changeless, certain, reliable, fixed, undeviating, stable, lasting, sure.
  • erratic
    predictable, consistent, unchanging, regular, definite.
  • excitable
    easy, insensitive, laid-back, easy-going, passive, uninspired, unexcitable.
  • fickle
    cognizant, faithful, aware.
  • fleet
    slow.
  • flighty
    responsible.
  • fluid
    inflexible.
  • mercurial
    unchangeable, calm, unperturbable, unvarying, tranquil.
  • Other antonyms:
    permanent, immutable, even, persistent, trustworthy, trusty, durable, predictable, equable, invariable, reliable, tried, tried and true, sure, dependable, uniform, abiding, true, lasting.