If something is assuredly true, it is definitely true.
例句
He is, assuredly, not alone in believing they will win...毫無疑問,不止他一個人認為他們會贏。The government most assuredly does believe in organic farming.政府確實堅信有機耕作切實可行。
英英詞典釋義
Adverb
1. without a doubt;
"the grammar schools were assuredly not intended for the gentry alone"