This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Characterized by sudden and forceful energy or emotion; impulsive and passionate.

adj. Having or marked by violent force: impetuous, heaving waves.

adj. Making arbitrary decisions, especially in an impulsive and forceful manner.

adj. Characterized by sudden and violent force.

adj. Rushing with force and violence; moving with impetus; furious; forcible; violent

adj. Vehement in feeling; hasty; passionate; violent.

Having or characterized by great impetus; rushing with force and violence; acting with sudden, vehement, or rash energy; performed or delivered with sudden, overbearing force: as, an impetuous torrent; an impetuous charge or harangue.

Synonyms Precipitate, hot, furious, vehement, passionate.

adj. characterized by undue haste and lack of thought or deliberation

adj. marked by violent force

"It was used in short, impetuous outbursts on occasions of triumph or mourning."

incautious    forceful   

deliberate    apathetic   

passionate    raging    hasty    forcible    boisterous    fierce    precipitate    furious    violent    rapid   

impulsive    passionate    reckless    headstrong    ardent    vehement    imperious    resolute    turbulent    haughty