原因|げんいんgen'in[0]heiban (flat)

JLPT N4approx.Common
げいいんgeiin
Definitions
  1. noun, suru verb, intransitive verbcause; origin; source
    それで事故じこの原因げんいんが分わかった。↗
    That accounts for the accident.
Conjugation
Dictionary form原因する(げんいんする)
Polite (masu)原因します(げんいんします)
Negative (nai)原因しない(げんいんしない)
polite (masen)原因しません(げんいんしません)
classical zu / nu原因せず・原因せぬ(げんいんせず・げんいんせぬ)
Past (ta)原因した(げんいんした)
polite (mashita)原因しました(げんいんしました)
Past negative (nakatta)原因しなかった(げんいんしなかった)
polite (masen deshita)原因しませんでした(げんいんしませんでした)
Te form原因して(げんいんして)
Potential原因できる(げんいんできる)
Passive原因される(げんいんされる)
Causative原因させる(げんいんさせる)
Causative passive原因させられる(げんいんさせられる)
Conditional (ba)原因すれば(げんいんすれば)
tara原因したら(げんいんしたら)
Volitional原因しよう(げんいんしよう)
polite (mashou)原因しましょう(げんいんしましょう)
Imperative原因しろ(げんいんしろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Synonyms & antonyms
  • Synonym起こりおこりNeutralThe origin or cause of an affair, as in 「事の起こり」; it stresses how something began, while 「原因」 stresses cause and effect.
  • Synonym素因そいんWrittenWritten/formal prose: a pre-existing latent factor stressing inner conditions; often medical, as in 「遺伝的素因」.
  • Synonym元もとNeutralThe root of trouble, as in 「風邪の元」「喧嘩の元」; to explain the cause of an accident and the like, 「原因」 is still the word.
  • Synonym因いんNeutralSame as the previous entry: 「因」 is merely another way of writing 「元(もと)」, identical in meaning.
  • Synonym由よしFormalFormal, archaic word for a reason or cause; today mostly 「〜の由」 to convey hearsay, as in 「ご病気の由」.
  • Synonym導因どういんWrittenWritten/formal prose: the inducement that brings a state about, stressing the factor that triggers it; mostly in academic analysis.
  • Antonym結果けっかNeutralThe opposite of 「原因」: the result or consequence that a cause brings about.

Use 「原因」 by default for what caused something, as in 「事故の原因」. 「元」 suits the root of trouble (「喧嘩の元」), 「起こり」 the origin of an affair, 「導因」 a trigger in academic prose, 「素因」 an underlying predisposition; 「由」 is archaic. 「結果」 is the opposite.

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

Japanese definitions
  1. 物事ものごとなどが起おこるもとのこと。
Kanji in this word
English equivalents
See also

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

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