Translation guide
The English word "invariable" describes something that never changes or is always the same. In Japanese, this concept is expressed through adjectives, adverbs, and set phrases that emphasize constancy, unchangeability, or fixed patterns.
Describing a state, quality, or condition that does not vary over time.
Expressing that something happens every time or is always true.
必ず (kanarazu) is the strongest, meaning 'without exception'. いつも (itsumo) is the most common and neutral 'always'. 決まって (kimatte) implies a predictable, often habitual pattern, sometimes with a nuance of 'as usual' or 'sure enough'.
While 不変 (fuhen) directly translates 'invariable', it can sound stiff or technical. In everyday conversation, 変わらない (kawaranai) or adverbial phrases like 必ず (kanarazu) are more natural.
The laws of nature are invariable.
The negative form of 変わる (to change), meaning 'unchanging' or 'constant'. This is the most common and natural way to express 'invariable' in everyday speech.
彼の日課は変わらない。
His daily routine is invariable.
A noun or no-adjective meaning 'fixed', 'constant', or 'uniform'. Often used for rates, intervals, or conditions that are set and do not fluctuate.
温度を一定に保つ。
Keep the temperature invariable.
A na-adjective meaning 'constant' or 'permanent'. Used in formal or technical contexts to describe something that remains unchanged over a long period.
恒常的な需要がある。
There is an invariable demand.
An adverb meaning 'always', 'without fail', or 'invariably'. It emphasizes that something happens every single time.
彼は必ず遅刻する。
He invariably arrives late.
A common adverb meaning 'always'. It is less emphatic than 必ず but very natural in casual conversation.
彼女はいつも笑顔だ。
She is invariably smiling.
An adverb meaning 'invariably' or 'without fail', often implying a predictable pattern or habit.
日曜日は決まって雨だ。
It invariably rains on Sundays.