How to say "functional" in Japanese
Choosing the right word
- na-adjectiveThe English loanword kept in katakana; it appears where the English term itself is used, such as fitness training or design jargon, and is rarely needed in ordinary sentences.
- 汎関数はんかんすうnounStrictly a mathematics term for a mapping that takes functions as input and returns a number; it is not the everyday adjective meaning practical, so it suits only mathematical writing.
- 機能的きのうてきna-adjectiveThe everyday adjective for things designed to work well and serve a practical purpose rather than a decorative one; this is the word you want in ordinary speech and writing.
Choose 機能的 for the everyday sense of practical and working well, 汎関数 exclusively for the mathematical term, and 「ファンクショナル」 when borrowing the English word in technical or fitness jargon.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese equivalents
