How to say "grounds" in Japanese

Choosing the right word
  • 訳わけJLPT N4approx.Common
    nounCovers the 'reason; cause' sense: why something happens or was done. For 'grounds' in the formal, justifying sense it is seldom the word you want; use 理由 or 根拠 instead.
    そういうわけで私はこんなに早はやく帰かえって来きたのです。↗
    That's why I came back so soon.
  • 理由りゆうJLPT N4approx.Common
    nounThe general word for 'grounds' as a reason or justification for an action, decision, or statement; it can also shade into the nuance of a pretext or excuse.
    どうしてあなたにお詫わびする理由りゆうがあるのですか。↗
    Why should I apologize to you?
  • 屋敷やしきJLPT N1approx.Common
    nounCovers 'grounds' only as land: it really denotes a residence or estate, so its 'grounds' sense is the premises around such a dwelling, not any kind of reason.
    彼かれはいなかの屋敷やしきに住すんでいる。↗
    He lives on his country estate.
  • 根拠こんきょJLPT N1approx.Common
    nounCovers 'grounds' as the basis or foundation on which a claim, argument, or decision rests; it stresses the underlying justification rather than the reason itself.
    その噂うわさは全まったく根拠こんきょがなかった。↗
    The rumor was completely without foundation.
  • 境内けいだいCommon
    nounCovers 'grounds' as land, but only the precincts of a shrine or temple (or a churchyard); it is not a word for the reason sense or for secular land.

'Grounds' as a reason splits three ways: 訳 for the reason why, 理由 the general word, 根拠 when an underlying basis is meant; as land, 屋敷 is an estate's grounds and 境内 a shrine or temple's precincts.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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