expression, adverb
truly; really; completely; indeed
Emphatic adverbial expression, stronger than 全く. Used to stress that something is entirely the case, often with a tone of conviction or exasperation.
See also: 全く (まったく)
全くもってその通りだ。
That is exactly right.
全くもって理解できない。
I really can't understand it at all.
全く is the base adverb meaning 'completely' or 'really'. 全くもって is a more emphatic version, often used for stronger assertion or exasperation.
Derived from 全く (mattaku, 'completely') + 以て (motte, 'with'), literally 'with completeness'. The combination intensifies the meaning.