Warrant adverbs are provided in this article. The words listed here are commonly found along with the verb warrant in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb WARRANT.
certainly, clearly
fairly, fully
hardly, necessarily
really, scarcely
Hope this word list had the warrant adverb you were looking for. In addition to adverbs used with warrant, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.