expression, adverb
exceedingly; extremely; very much
Emphatic adverbial expression meaning 'extremely' or 'exceedingly'. Often used to intensify a judgment or feeling, and can carry a slightly formal or emphatic tone.
彼の態度ははなはだもって失礼だ。
His attitude is exceedingly rude.
その提案ははなはだもって不十分だった。
The proposal was extremely insufficient.
Derived from the adverb はなはだ (very) combined with the emphatic particle もって (以て), reinforcing the meaning to 'exceedingly'.