exactly; perfectly; without the slightest difference
Emphasizes that something matches or is reproduced with absolute precision, down to the smallest detail. Often used in formal or emphatic contexts.
彼は寸分違わず同じ動作を繰り返した。
He repeated the exact same motion without the slightest difference.
このコピーは原本と寸分違わず一致している
This copy matches the original perfectly.
全く means 'completely' or 'entirely' and is a general adverb, whereas 寸分違わず specifically focuses on the absence of any difference.
Standard kanji spelling.
Variant with kana for 違わず; less common but still used.
From 寸 (すん, a very small unit of length) and 分 (ぶん, a fraction of a 寸), combined with 違わず (negative of 違う, 'to differ'), literally meaning 'not differing by even a 寸 or 分'.