Synonyms for Something fierce:

• adj.

  •madly (adjective)
  • passionately,
  • excessively,
  • intensely,
  • rashly,
  • extremely,
  • exceedingly,
  • desperately,
  • foolishly,
  • quickly,
  • rapidly,
  • irrationally,
  • crazily,
  • violently,
  • energetically,
  • excitedly,
  • furiously,
  • hard,
  • frantically,
  • insanely,
  • recklessly.
  •Other relevant words: (adjective)
  • devotedly,
  • distractedly,
  • dementedly,
  • Rabidly,
  • senselessly,
  • hysterically,
  • to distraction,
  • nonsensically,
  • psychotically,
  • speedily,
  • madly,
  • turbulently,
  • unreasonably,
  • more rapidly,
  • absurdly,
  • hurriedly,
  • like mad,
  • stormily,
  • hastily,
  • deliriously,
  • frenziedly,
  • ludicrously.

• adv

  •Other relevant words: (adverb)
  • unrelentingly,
  • callously,
  • ruthlessly,
  • barbarically,
  • diabolically,
  • brutishly,
  • barbarously,
  • ferociously,
  • Inhumanly,
  • hardheartedly,
  • unkindly,
  • atrociously,
  • something terrible,
  • brutally,
  • demoniacally,
  • mercilessly,
  • pitilessly,
  • inhumanely,
  • relentlessly,
  • ferally.

• adv.

  •brutally (adverb)
  • in cold blood,
  • fiercely,
  • meanly,
  • murderously.
  •Other relevant words: (adverb)
  • remorselessly,
  • viciously,
  • savagely,
  • inexorably,
  • heartlessly.

• n.

  •Other relevant words: (noun)
  • distressingly,
  • miserably,
  • dreadfully,
  • sadly,
  • deathly,
  • Infamously,
  • cruelly.

Antonyms for Something fierce:

• adj.

  • madly
    normally, calmly.

• adv.

  • brutally
    humanely, gently, kindly, nicely.