How to say "enthusiastically" in Japanese

• パーッと
  adverbFits bursts of festive energy — celebrating, partying, or going all out with a splash. Its enthusiasm is the party kind, not plain everyday eagerness about work or study.
  子供こどもにお金かねを残のこそうなんて考かんがえずにパーッと派手はでに遊あそんで使い切つかいきって下くださいね。↗

  Don't think about leaving money for your kids, use it all up and enjoy yourself with flair.
• 景気よくけいきよく
  expression, adverbEnthusiasm with gusto and wild abandon: loud, unrestrained, high-spirited behavior. Think of people eating, drinking, or cheering with boisterous energy at a lively gathering.
• 勢いよくいきおいよく
  adverbChiefly about physical vigor: moving or acting with great force and momentum. 'Enthusiastically' fits only when that force expresses eagerness, so it is often not the word you want for plain enthusiasm.
  水道すいどうの水みずが勢いきおいよく出でている。↗

  The water is running with great force.
• 盛んにさかんに
  adverbDescribes activity carried on actively and heartily — sustained, vigorous pursuit rather than a momentary burst. Suits someone energetically discussing, promoting, or otherwise pressing on with something.
• もりもり
  adverb (with と)A mimetic word for energetic, enthusiastic action, often tucking into food or work with hearty vigor. It paints eager, vigorous effort rather than emotional excitement.

Pick by the flavor of enthusiasm: festive bursts (「パーッと」), boisterous gusto (「景気よく」), physical force behind eager motion (「勢いよく」), sustained active pursuit (「盛んに」), or hearty vigorous effort (「もりもり」).

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• パーッとwith energy (of parties and such)
• 景気よくけいきよくwith gusto
• 勢いよくいきおいよくvigorously
• 盛んにさかんにactively
• もりもりenergetically