How to say "rampant" in Japanese

• 奔放ほんぽうCommon
  na-adjective, nounCovers 'rampant' as wild and uninhibited rather than spreading unchecked; it suggests a free, unrestrained spirit or behavior, sometimes with an extravagant nuance.
  私は奔放ほんぽうな生き方いきかたにあこがれている。↗

  I long for an uninhibited way of life.
• 野放図のほうずCommon
  na-adjective, nounCovers 'rampant' in the sense of uncontrolled growth or excess, as with weeds running rampant or spending that is endless; the nuance is something left to spread without restraint.

Use 奔放 when 'rampant' means wild and uninhibited in spirit or behavior, and 野放図 when it means uncontrolled and spreading, as with rampant weeds or endless spending.

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

• 奔放ほんぽうwild
• 野放図のほうずendless (e.g. spending)
• ぼうぼうrampant (weeds, etc.)