Assured adverbs are provided in this article. The words listed here are commonly found along with the verb assured in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb ASSURED.
absolutely, calmly, certainly, completely, confidently, constantly, continually, definitely, doubly
earnestly, emphatically, entirely, equally, expressly, fairly, finally, firmly, formally
frequently, fully, generally, graciously, gravely, hastily, immediately, infallibly, kindly
lately, mutually, perfectly, permanently, personally, plainly, positively, practically, previously
privately, probably, promptly, quickly, quietly, reasonably, recently, repeatedly, seriously
simply, solemnly, sufficiently, thoroughly, virtually
Hope this word list had the assured adverb you were looking for. In addition to adverbs used with assured, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.