1.
rational, reasonable, logical
Based on reason or logic; sensible and practical.
合理的な判断をする。
Make a rational judgment.
それは合理的な説明だと思う。
I think that's a reasonable explanation.
感情ではなく合理的に考えるべきだ。
You should think rationally, not emotionally.
2.
efficient, streamlined
Practical and efficient, without waste.
もっと合理的なやり方を考えよう。
Let's think of a more efficient method.
時間を合理的に使いたい。
I want to use my time efficiently.
この工場では合理的な生産システムを導入して、無駄を減らしている。
This factory has introduced an efficient production system to reduce waste.
USAGE: 合理的 is a ～的 adjective used to describe decisions, explanations, and methods that are based on logic and reason.
FORMS:
- 合理的な＋noun (rational/reasonable ~)
- 合理的に (rationally - adverbial form)
COMMON COLLOCATIONS:
- 合理的な判断 (rational judgment)
- 合理的な説明 (reasonable explanation)
- 合理的な理由 (rational reason)
- 合理的に考える (to think rationally)
CONTRAST:
- 非合理的 - irrational, unreasonable (antonym)
- 感情的 - emotional (often contrasted)
LEGAL CONTEXT: In legal documents, 合理的 often corresponds to "reasonable" as in "合理的な配慮" (reasonable accommodation).
Related Words
Antonym:
非合理的 (irrational)