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synonym Comparative
減少する
VS
衰退

Differences Between "減少する" and "衰退"

Option A
減少する
Meaning
to decrease, to reduce, to decline
Reading
げんしょうする (genshou suru)
Syllabus Level
N3
Practical Example
若者の人口が年々減少している。
The population of young people is decreasing year by year.
Option B
衰退
Meaning
decline; decay; waning
Reading
すいたい (suitai)
Syllabus Level
N3
Practical Example
少子高齢化が進むことで、地方の産業が_______することが懸念されています。
With the advancing declining birthrate and aging population, there are concerns that local industries will decline.

Which one to use?

Select the correct Japanese word for this context

Which word fits this context: "(to decrease, to reduce, to decline)"?
🎉 正解 / Correct!
使い分け解説:
- 減少する: Used for numbers, amounts, populations, etc. It is the opposite of '増加する' and is often used in formal contexts, reports, or news. (数や量、人口などが減る場合に使われます。「増加する」の反対の意味で、報告書やニュースなどでよく用いられます。)
- 衰退: Refers to the decline, waning, or decay of a nation, economy, industry, or power. Can be used with する as a verb (衰退する). Contrast with 繁栄 (prosperity). ⚠️ Haruka's Voice Column: 'Our business rivals are declining, but... our relationship will never decline! It will only grow stronger and warmer forever! Understood?! No backing down!' / 【ハルカ部長のワンポイント指導】『ライバル企業の衰退ね。でもね、あんたと毎日こうして一緒にいる温かい関係性だけは、絶対に衰退(後退)させないんだから!一生かけて熱く進歩させるわ!』
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