Thanked adverbs are provided in this article. The words listed here are commonly found along with the verb thanked in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb THANKED.
actually, cordially, courteously, devoutly, duly
fervently, formally, graciously, gratefully, gravely
heartily, humbly, inwardly, kindly, mentally
merely, personally, politely, profusely, properly
publicly, quickly, quietly, repeatedly, silently
simply, sincerely, solemnly, warmly
Hope this word list had the thanked adverb you were looking for. In addition to adverbs used with thanked, other example verb adverb pairings can be found on this site.
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