必ずしも (not necessarily)

• Reading: かならずしも
• Romaji: kanarazu shimo
• Formation: 必ずしも + Predicate（negative form）
• Kanji breakdown: 必 (certain/inevitable) + ず (classical negative) + しも (emphatic particle)

Meaning

An adverb used with negative predicates to indicate that a proposition is not always or necessarily true. It conveys 'not necessarily,' 'not always,' or 'not entirely.'

必ずしも always appears with a negative predicate and expresses partial negation — acknowledging that while something may often be the case, it is not universally or invariably true. It differs from 全然…ない which is a complete negation, and from いつも…ない which focuses on temporal frequency. 必ずしも targets the certainty or universality of a statement. It is common in academic writing, debates, and thoughtful conversation where nuanced positions are expressed. The pattern encourages the listener to consider exceptions to general rules.

Examples

1. 高いものが必ずしもいいとは限らない。 Expensive things are not necessarily good.
2. 努力すれば必ずしも成功するわけではない。 Making an effort does not necessarily guarantee success.
3. 有名な大学を出れば必ずしもいい仕事に就けるとは言えない。 Graduating from a famous university doesn't necessarily mean you'll get a good job.

Usage Guide

Context: written, spoken, academic

Tone: analytical

Do Say

• 人気がある店が必ずしも美味しいわけではない。
• 薬を飲んでも必ずしもすぐに治るとは限らない。
• 外国語を勉強しても必ずしも流暢に話せるようになるわけではない。

Don't Say

• 必ずしも明日は来ます。(必ずしも must pair with a negative predicate) → 必ずしも明日来られるとは限らない。
• 必ずしも彼は優しい人だ。(必ずしも requires negation; this affirmative sentence is incorrect) → 必ずしも彼が優しい人だとは言えない。

Origin & History

必ずしも combines 必ず (certainly/always) with しも (an emphatic particle). Together with negation, it creates 'not even certainly' — expressing that absolute certainty does not apply.

Cultural Context

Generation: All ages

Social background: Universal