〜しむ / せしむ: Classical Causative | Japanese Grammar

Modern Japanese makes someone do something with させる／せる — 完成させる ("make [someone] complete it"), 感動させる ("move [someone]"). Those replaced an older auxiliary, しむ, the classical causative. But しむ did not vanish. It lives on as a higher, weightier variant of the very same causative, reserved for prose that wants to sound grave: scripture translation, statute, philosophy, literary criticism, and ceremonial oratory (荘重体). 完成させる is neutral; 完成せしめる is the same act of causing, in a ceremonial collar. That is the whole insight of this page — しむ is not a different meaning, it is させる in dress uniform. Once you read 〜せしむ／〜しめる as simply "cause to," the elevated prose that uses it stops feeling opaque and starts feeling merely dignified.

What しむ is, and how it attaches

しむ is the classical 使役（causative）auxiliary, "make / let someone do." It attaches to the 未然形（irrealis stem） of a verb — the same slot modern せる／させる and the negative ず use. It conjugates on the 下二段 pattern, whose modern reflex is the 下一段 ending 〜しめる:

未然形	連用形	終止形	連体形	已然形	命令形
しめ	しめ	しむ	しむる	しむれ	しめよ

So the terminal 〜しむ appears in older documents, while the form you meet in modern formal writing is the 連体／連用 reflex 〜しめる. The most common survivals come from サ変 verbs (X + する), whose 未然形 is せ — giving the fused shape 〜せしめる:

Verb	未然形	＋しむ → modern	Neutral equivalent
感動する	感動せ	感動せしめる	感動させる
完成する	完成せ	完成せしめる	完成させる
有り（ラ変）	有ら	有らしめる	存在させる
可能（な-adj/なり）	可能なら	可能ならしめる	可能にする

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Two shapes cover almost every modern survival: 〜せしめる（from a する-verb: 感動せしめる, 完成せしめる, 想起せしめる）and 〜ならしめる（from the classical copula なり: 可能ならしめる, 明らかならしめる）. Plus 有らしめる, "cause to exist." Recognize those two silhouettes and you can parse the rest.

The register contrast: せしめる vs させる

The pair 完成させる / 完成せしめる mean the same thing — "cause it to be completed." The difference is entirely tonal. させる is the everyday causative. せしめる is chosen to lend gravity: a translator reaching for the weight of scripture, a philosopher naming a first cause, a critic praising a work's power.

この作品は読者を深く感動せしめる。

kono sakuhin wa dokusha o fukaku kandō seshimeru

This work moves its readers deeply. (感動せしめる — literary-criticism register; 感動させる would say the same thing plainly)

彼の献身が計画を完成せしめた。

kare no kenshin ga keikaku o kansei seshimeta

His devotion brought the plan to completion. (完成せしめた lends the sentence a formal, almost monumental weight)

その一句が往時の記憶を想起せしめる。

sono ikku ga ōji no kioku o sōki seshimeru

That single line calls up memories of days gone by. (想起せしめる — the elevated 'causes [one] to recall')

Notice you can always paraphrase back to させる／にする without losing the meaning — only the solemnity goes:

読者を感動させる作品だ。

dokusha o kandō saseru sakuhin da

It's a work that moves its readers. (the plain-register twin of 読者を感動せしめる作品 — identical sense, ordinary tone)

In kanbun: 使 and 令 read as しむ

しむ is a headline signature of the 漢文訓読 register because the Chinese causatives 使 and 令 are glossed as しむ. The construction "使 A B" ("make A do B") is read in Japanese as A をして B しむ — "cause A, and make [A] do B":

天帝我をして百獣に長たらしむ。

tentei ware o shite hyakujū ni chō tarashimu

The Emperor of Heaven made me chief of all the beasts. (a 訓読 of 使我長百獣; 長たら = noun 長 + copula たり's 未然たら, then しむ — causation stacked on the classical copula)

That AをしてBしむ frame is worth recognizing on sight: を marks the causee, して bridges to the caused action, and しむ closes it. It is the classical skeleton behind the whole causative in kanbun-flavored prose.

The weighty こと: 有らしめる and 荘厳ならしめる

Two survivals deserve their own line because they carry real ceremonial weight. 有らしめる means "bring into being, cause to exist" — a phrase reached for in theology and philosophy where "make exist" would sound flat:

光あれ、と神は言い、光を有らしめた。

hikari are, to kami wa ii, hikari o arashimeta

'Let there be light,' God said, and brought light into being. (有らしめる — scriptural-translation register for 'cause to exist')

And 〜ならしめる, built on the classical copula, means "render / make [it] be (a certain way)":

細部への配慮が式典を荘厳ならしめた。

saibu e no hairyo ga shikiten o sōgon narashimeta

Attention to detail made the ceremony truly solemn. (荘厳ならしめる = 'render majestic' — the copula なり's 未然なら + しむ)

制度改革が長期の成長を可能ならしめる。

seido kaikaku ga chōki no seichō o kanō narashimeru

Institutional reform makes long-term growth possible. (可能ならしめる — formal-essay 'render possible', weightier than 可能にする)

An honest footnote: the pickpocket せしめる

There is one survival that jumped register entirely. Colloquial せしめる became an independent verb meaning "to wangle, to score, to get (often by cunning)" — as in "make [it] become mine." It is casual, slightly roguish, and unrelated in tone to the lofty auxiliary, even though it descends from the same causative:

うまいこと言って、親から小遣いをせしめた。

umai koto itte, oya kara kozukai o seshimeta

He talked his way into wheedling some pocket money out of his parents. (せしめる here = 'wangle, score' — colloquial; historically the same causative, tonally a world apart)

Do not let this everyday せしめる ("swindle out of") confuse you with 感動せしめる ("move deeply"). Same origin, opposite register — the auxiliary is solemn, the lexical verb is cheeky.

Common mistakes

❌ 感動しめる

kandō shimeru

Wrong stem — する verbs take the 未然形せ before しむ, so it is せしめる, not しめる bolted onto the noun.

✅ 感動せしめる

kandō seshimeru

moves [someone] deeply (感動する → 未然形せ + しめる = 感動せしめる, the サ変 pattern)

The commonest slip is dropping the せ. しむ attaches to the 未然形, and する's 未然形 is せ — hence せしめる. There is no ×感動しめる.

❌ 〜せしめるは尊敬語で「なさる」の意味だ。

seshimeru wa sonkeigo de 'nasaru' no imi da

Wrong — reading 〜せしめる as an honorific 'do.' It is causative 'make/let do,' just in an elevated register.

✅ 〜せしめる＝〜させる（使役）を重々しくしたもの。

seshimeru wa saseru o omoomoshiku shita mono

〜せしめる is させる (causative) in a weightier register. (same 'cause to,' loftier tone — not honorification)

Because せしめる sounds grand, learners guess it must be keigo. It is not. It is causation; the grandeur is register, not respect.

❌ 明日までに資料を完成せしめてください。

ashita made ni shiryō o kansei seshimete kudasai

✅ 明日までに資料を完成させてください。

ashita made ni shiryō o kansei sasete kudasai

Please have the materials done by tomorrow. (ordinary requests use させる; save せしめる for elevated written prose)

せしめる is not a fancier way to be polite in everyday speech — it is a written, ceremonial choice. In a normal request it lands as pretentious.

❌ 荘厳になりしめる

sōgon ni narishimeru

Wrong — trying to build it from modern なる + しめる. The classical form uses the copula なり's 未然なら.

✅ 荘厳ならしめる

sōgon narashimeru

render [it] majestic (な-adjective/copula stem 荘厳なら + しめる = ならしめる, not なりしめる or になりしめる)

〜ならしめる is built on the classical copula なり (未然なら), the ancestor of modern な. It is ならしめる — one fused piece — never なる＋しめる.

Key takeaways

しむ = the classical causative "make / let do," replaced by させる／せる but alive as a higher-register variant; read 〜せしむ／〜しめる as plain "cause to."
It attaches to the 未然形 and conjugates 下二段（しめ／しむ／しむる…）, surviving today as 〜しめる.
Two dominant shapes: 〜せしめる（from する-verbs: 感動せしめる, 完成せしめる, 想起せしめる）and 〜ならしめる（from the copula: 可能ならしめる, 荘厳ならしめる）, plus 有らしめる "bring into being."
感動させる vs 感動せしめる = identical meaning, opposite register: させる is neutral, せしめる lends ceremonial gravity — misusing it in casual speech sounds pompous.
In kanbun, 使 and 令 are read しむ, in the frame A をして B しむ ("make A do B").
Footnote: colloquial せしめる = "wangle / score," same root but a cheeky, everyday tone — do not confuse it with the lofty auxiliary.

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