If something is assuredly true, it is definitely true.
例句
He is, assuredly, not alone in believing they will win...毫无疑问,不止他一个人认为他们会赢。The government most assuredly does believe in organic farming.政府确实坚信有机耕作切实可行。
英英词典释义
Adverb
1. without a doubt;
"the grammar schools were assuredly not intended for the gentry alone"