How to say "constant" in Japanese
Choosing the right word
- 不断ふだんno-adjective, na-adjectiveCovers 'constant' in the sense of persistent, unremitting effort or attention continuing without interruption, as in ceaseless practice or diligence. It stresses that something never lets up, rather than that a value stays the same.
- na-adjectiveCovers 'constant' as a loanword for steady, unvarying performance or output over time, as when sales or results remain at a stable level. It has a smooth, ongoing feel rather than describing abstract invariability.
- 変わらないかわらないi-adjectiveCovers 'constant' meaning simply unchanging or invariant, used in plain description of something that remains the same, such as an unchanged attitude or scenery. It is a straightforward way to say nothing has altered.
- 不変ふへんna-adjective, no-adjectiveCovers 'constant' only in the strong sense of eternal, immutable, unchangeable, as with truths or principles that never change. For everyday constancy of amounts or rates it is usually stronger than you want.
- 一定いっていno-adjectiveCovers 'constant' meaning fixed, definite, or uniform, as in a constant speed, temperature, or amount that holds at a set level. This is the natural choice when a quantity stays at one determined value.
Choose 不変 for unchanging permanence, 一定 for fixed amount or rate, 「コンスタント」 for steady performance, 不断 for persistent ceaseless effort, and 「変わらない」 for plain description of something not changing.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese equivalents
See also
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