成果|せいかseika[1]atamadaka (head-high)

1. noun(good) result; outcome; fruits (of one's labors); product; accomplishment
   努力どりょくしたが何なんの成果せいかも得えられなかった。↗

   My efforts produced no results.

• Synonym結果けっかNeutralA plain result, good or bad, as in 「試験の結果」. 「成果」 is reserved for good results achieved through effort.
• Synonym結実けつじつWrittenWritten/formal prose: efforts finally bearing fruit or paying off, as in 「努力が結実する」. More literary than 「成果」.
• Synonym所産しょさんWrittenWritten/formal prose for a product or fruit of something, as in 「文化の所産」. Abstract output, typical of essays.
• Related成り行きなりゆきNeutralThe course of events or how things develop, as in 「成り行きに任せる」. Focuses on the process, with no judgement of good or bad.
• Related効果こうかNeutralAn effect or efficacy, as in 「効果がある」. Emphasizes how something works on a situation, while 「成果」 stresses what is produced.
• Related結末けつまつNeutralHow a story or event ends, as in 「意外な結末」. Points to the closing of things rather than the fruits of effort.
• Related首尾しゅびWrittenWritten/formal prose: the whole course of events or the outcome, as in 「首尾よく」; stresses whether things went smoothly.
• Related影響えいきょうNeutralInfluence or impact, as in 「影響を与える」. Concerns the effect spreading to something else, not an achievement.
• Related収穫しゅうかくNeutralA harvest or gain, as in 「大きな収穫」. Also the literal crop yield; often figurative for what one gets out of something.
• Related産物さんぶつNeutralA product of something, as in 「時代の産物」. Highlights what a certain background or era gives rise to.
• Related始末しまつNeutralThe course of events or, usually, a bad outcome, as in 「この始末だ」. Often carries a negative nuance.
• Related実りみのりNeutralRipening or harvest, as in 「実りの秋」「実りある議論」. A positive, figurative word for the fruits of effort.
• Related仕儀しぎWrittenWritten/formal prose for how things turned out, often implying an unfortunate result; rare in modern usage.
• Antonym失敗しっぱいNeutralFailure; the opposite of 「成果」, which is a good result achieved through effort.
• Antonym無駄むだNeutralFutility or wasted effort; the opposite of 「成果」, where effort pays off.

Use 「成果」 for good results earned through effort, as in 「研究成果」「成果を上げる」. For results in general pick 「結果」, for effects 「効果」, for gains 「収穫」; the opposites are 「失敗」 and 「無駄」.

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

1. 出来上できあがった良よい結果けっか。