Believed adverbs are provided in this article. The words listed here are commonly found along with the verb believed in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb BELIEVED.
absolutely, actually, apparently, ardently, assuredly, barely, blindly, certainly, clearly, commonly, completely, confidently, conscientiously, consequently, consistently, constantly, cordially, correctly, currently, deeply
definitely, devoutly, differently, eagerly, earnestly, easily, entirely, equally, erroneously, especially, evidently, exactly, extensively, faithfully, falsely, fervently, finally, firmly, fondly, foolishly
formerly, frequently, fully, generally, genuinely, hardly, heartily, honestly, immediately, implicitly, incorrectly, increasingly, initially, innocently, instinctively, intensely, justly, largely, likely, literally
merely, mistakenly, mostly, naively, naturally, nearly, necessarily, obviously, ordinarily, originally, partly, passionately, personally, piously, plainly, popularly, possibly, previously, privately, probably
profoundly, readily, really, reasonably, recently, religiously, rightly, scarcely, secretly, seriously, similarly, simply, sincerely, solemnly, steadfastly, strongly, suddenly, surely, thoroughly, totally
traditionally, truly, typically, ultimately, unanimously, undoubtedly, unhesitatingly, uniformly, universally, unquestionably, usually, vaguely, verily, wholeheartedly, wholly, widely, willingly, wrongly
Hope this word list had the believed adverb you were looking for. In addition to adverbs used with believed, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.