How to say "numerous" in Japanese

• 多いおおいJLPT N5approx.Common
  i-adjectiveThe plain, everyday word for 'many' or 'a lot'; it covers most cases where English 'numerous' simply means a large number of people or things, and is the safest default choice.
  ２０代だいの若わかい女性じょせいの中なかには、夏休なつやすみに海外旅行かいがいりょこうにでたいと思おもう人ひとも多おおい。↗

  Many young women in their 20s plan to go abroad during their summer holidays.
• 数々かずかずCommon
  no-adjective, adverbEmphasizes a large and varied number — 'many different' things; it typically stands before a noun and suits recounting a host of events, experiences, or items of various kinds.
  彼かれの演説えんぜつには数々かずかずのすばらしい言い回いいまわしが含ふくまれていた。↗

  His speech contained many fine phrases.
• 多しおおしCommon
  adjective (archaic)Rarely the word you want for plain 'numerous'; it survives mainly in set phrases and evaluative remarks, where its second sense, 'frequent', describes things said or seen again and again.
• 幾多いくたJLPT N1approx.Common
  no-adjective, adverbA weighty, sweeping word for 'many', usually placed before a noun; it suits narration that sums up a great number of things experienced or encountered over time.
  我々われわれは幾多いくたの困難こんなんを克服こくふくしなければならない。↗

  We have to cope with hosts of difficulties.

For plain 'many' choose 「多い」; 数々 stresses a varied host of things and precedes a noun; 幾多 gives an emphatic, sweeping 'many'; 「多し」 is largely confined to set phrases and evaluative remarks.

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

• 多いおおいmany
• 数々かずかずmany
• 多しおおしnumerous
• 幾多いくたmany
• 数あるかずあるnumerous
• あまたmany
• 数多すうたmany