How to say "unspecified" in Japanese

• 不特定ふとくていCommon
  no-adjective, na-adjectiveCovers 'unspecified' meaning not pinned down to any one person, thing, place, or amount — it could be any of many. The usual choice when something is simply not specified rather than not known.
• 不詳ふしょうCommon
  na-adjective, no-adjectiveIts core sense is 'unknown' or 'unidentified': a fact or detail that is not known and cannot be confirmed, as in written records. For 'unspecified' it fits only when the point is lack of knowledge.

Use 不特定 for something not pinned down to any particular person, thing, or amount, and 不詳 for details that are unknown or cannot be confirmed; the latter really means 'unknown', suiting 'unspecified' only in that sense.

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

• 不特定ふとくていunspecified
• 不詳ふしょうunknown
• 未規定みきていunspecified
• 未定義みていぎundefined