How to say "bound" in Japanese

• はずJLPT N4approx.Common
  auxiliaryCovers the expectation sense, as in 'bound to be'. Used to say something is expected or should be the case, e.g. reasoning that a plan is sure to have succeeded.
  その飛行機ひこうきは今いまごろは関西空港かんさいくうこうに当然とうぜん着ついているはずだ。↗

  The plane should have arrived at Kansai Airport by now.
• 限界げんかいJLPT N3approx.Common
  no-adjectiveCovers the noun sense 'bound' as a limit or boundary, such as the bounds of one's ability or patience. It is the natural choice for abstract or physical limits rather than motion.
  あらゆるものに限界げんかいがある。↗

  There is a limit to everything.
• バウンドCommon
  noun, suru verb, intransitive verbThe loanword sense of 'bound' as bouncing, typically describing a ball hitting a surface and springing back up. Common in sports and everyday talk about things bouncing.
  球たまはバウンドして塀へいを越こえた。↗

  The ball bounced over the wall.
• 弾むはずむJLPT N1approx.Common
  godan verb, intransitive verbA verb meaning to bounce or spring, covering the intransitive 'bound' of a ball or object rebounding off a surface. Also used when a ball bounces in play.
  ボールははずんで塀へいを飛び越とびこえた。↗

  The ball bounced over the wall.
• はねるJLPT N2approx.Common
  ichidan verb, intransitive verbMatched via 'to bound', but its glosses center on jumping and leaping, so it suits a person or animal springing up or leaping rather than a ball's bounce; for that, バウンド or 弾む is usually the better fit.
  犬いぬが跳はねるのをごらん。↗

  Look at the dog jump.

For 'bound to be' use 「はず」; for a boundary or limit use 限界; for physical bouncing use 「バウンド」 or 「弾む」; for leaping movement 「はねる」 is closest, though it centers on jumping.

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

• はずshould (be)
• 限界げんかいlimit
• バウンドbounce
• 弾むはずむto spring
• はねるto jump
• 跳躍ちょうやくjump
• 境するさかいするto bound
• 極まりきわまりextremity
• 限度枠げんどわくallowable range
• きりbound
• 飛ぶとぶto jump
• 弾けるはじけるto bounce