不ふ変へん

ふ

へ

ん

Common wordJLPTN1Freq.FrequencyTop 50,000

Meanings

na-adjective, noun which may take the genitive case particle 'no', noun

unchanging; constant; eternal; immutable

Describes something that does not change over time, such as principles, truths, or natural laws. Can be used as a noun, na-adjective, or no-adjective.

Antonyms: 可変

自し然ぜんの法ほう則そくは不ふ変へんだ。
The laws of nature are unchanging.
彼かれの信しん念ねんは不ふ変へんのものだ。
His convictions are immutable.

noun

invariant

mathematics

Mathematics term for a quantity or property that remains unchanged under a given transformation.

この式しきの値あたいは変へん換かんに対たいして不ふ変へんである。
The value of this expression is invariant under the transformation.

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Usage patterns

不ふ変へんの真しん理りan unchanging truth
自し然ぜんの法ほう則そくは不ふ変へんの真しん理りだと考かんがえられている。
The laws of nature are considered unchanging truths.
〈事こと〉を不ふ変へんに保たもつto keep something constant/unchanging
会かい社しゃはその経けい営えい方ほう針しんを不ふ変へんに保たもってきた。
The company has kept its management policy constant over the years.
不ふ変へんの価か値ちan unchanging/eternal value
彼かれの作さく品ひんには不ふ変へんの価か値ちがある。
His works have a value that never changes.

Kanji

不negative, non-, bad
変unusual, change, strange

Related words· 8

一いっ定ていN3sense 1
不変 stresses that something never changes at all, whereas 一定 just means fixed or constant at a given value and can allow later change.
永えい久きゅうN3sense 1
不変 focuses on the unchanging quality of something, while 永久 emphasizes that it will last forever in time.
恒こう久きゅうN1sense 1
不変 means something does not change, while 恒久 means something is long-lasting or permanent, often used for peace or institutions.
永えい遠えんN3sense 1
不変 highlights the quality of not changing, whereas 永遠 highlights endless duration of time itself.

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不ふ動どう
不変 means 'unchanging' and is used for abstract qualities staying constant, while 不動 stresses physical immovability or unshakable resolve.
変かわらない
不変 is a formal, Sino-Japanese word for something immutable or eternal, while 変わらない is the everyday adjective for something that simply stays the same.
恒こう常じょう
不変 describes something unchanging, often a concrete property or value, whereas 恒常 emphasizes a continuous, enduring state in a more abstract sense.
不ふ滅めつ
不変 means 'unchanging' and focuses on lack of change over time, while 不滅 focuses on not being destroyed or dying out.

Opposites· 5

可か変へん sense 1
variable; changeable; adjustable
変へん化かN3
不変 means unchanging or invariable, the direct opposite of 変化, which describes something that changes.
一いっ変ぺんN2
不変 means 'unchanging, constant', the direct opposite of 一変's sudden total transformation.

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一いっ転てん
不変 describes something that stays unchanging and constant, the opposite of 一転's sense of a sudden, dramatic reversal.
変へん移い
不変 means unchanging or constant, the direct opposite of 変移, which describes something undergoing change.

Don't confuse with

普ふ遍へんN1sense 1
不変 (ふへん) means 'unchanging', while 普遍 (also ふへん) means 'universal' or 'applying to everything'; they sound identical but differ completely in meaning.
普ふ遍へん的てき
不変 (ふへん) is a homophone of 普遍 that means 'unchanging', so it is easily confused in speech with 普遍的's base noun despite the unrelated meaning.

Word family· 11

不ふ変へん化か
indeclinable
不ふ変へん性せい
invariance
不ふ変へん量りょう
invariant; constant
一いっ定てい不ふ変へん
invariable; permanent; constant and unchanging
不ふ変へんの理り
eternal truth; unchanging principle

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不ふ変へん費ひ用よう
fixed cost
不ふ変へん資し本ほん
constant capital
不ふ変へん質しつ量りょう
invariant mass
恒こう久きゅう不ふ変へん
permanent and immutable; eternally unchanging
永えい久きゅう不ふ変へん
eternal and unchanging; permanence

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Etymology

Compound of 不 (fu, 'not') and 変 (hen, 'change'), literally 'no change'. The reading is on'yomi.