~とは限らない

Japanese Grammar Intermediate Japanese ★★★★ 4/5 neutral とはかぎらないtowa kagiranai
Reading とはかぎらない
Romaji towa kagiranai
Formation Verb plain form / Adj / Noun + だ + とは限らない
Kanji breakdown 限る (かぎる) — to limit, to restrict

Meaning

A phrase meaning 'not necessarily' or 'it isn't always the case that...' Used to challenge generalizations or assumptions by pointing out exceptions.

とは限らない is used to express that something generally assumed or believed to be true may not always hold. It challenges absolutes and acknowledges exceptions. For example, '高いものがいいとは限らない' (Expensive things aren't necessarily good). It often follows statements with いつも, 必ず, みんな, or other words implying universality. This pattern is useful in debates, essays, and everyday conversation when offering a balanced view. It differs from わけではない in that とは限らない specifically targets the 'always/necessarily' aspect of a claim, while わけではない denies an implied conclusion more broadly.

Examples

  1. 努力すれば必ず成功するとは限らない。 Even if you make an effort, success isn't guaranteed.
  2. 高い薬が効くとは限らない。 Expensive medicine isn't necessarily effective.
  3. 有名な大学を出たからといって優秀だとは限らない。 Just because someone graduated from a famous university doesn't mean they're talented.

Usage Guide

Context: spoken, written, everyday

Tone: cautionary

Do Say

  • 若いからといって健康だとは限らない。
  • 経験が長い人が上手だとは限らない。
  • 安全だと言われている場所が安全だとは限らない。

Don't Say

  • 明日は雨が降るとは限らない。(Using とは限らない when nobody assumed it would rain — this pattern corrects an existing assumption or generalization) → 明日は雨が降るかもしれないし、降らないかもしれない。
  • 彼が来ないとは限る。(Using 限る instead of 限らない — 限る without negation means 'nothing beats' or 'is the best,' completely changing the meaning) → 彼が来ないとは限らない。

Origin & History

Combines the quotation particle と, the topic marker は, and 限らない (negative of 限る, to limit). Literally 'it is not limited to the case that...' denying that something is always true.

Cultural Context

Generation: All ages

Social background: Universal

Related Phrases

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