expression, noun-modifying (irregular)
exactly the same; identical; perfect
Fixed prenominal expression emphasizing that two things match in every detail, with no difference whatsoever. Often used in literary or emphatic contexts.
彼の描いた絵は本物と寸分違わぬ出来栄えだった。
The painting he made was identical to the real thing in every detail.
二人の意見は寸分違わぬほど
Their opinions matched so perfectly that there was not the slightest difference.
瓜二つ is an idiomatic noun phrase meaning 'as alike as two peas in a pod', typically used for people's appearances, whereas 寸分違わぬ can apply to any exact match.
Standard kanji spelling for this fixed expression.
Kana spelling of the verb part; common in less formal writing.
Compound of 寸分 (a tiny amount, from 寸 'sun' and 分 'bu', both small units of length) + 違わぬ (negative form of 違う 'to differ'), literally 'not differing by even a sun or bu'.