Forbid adverbs are provided in this article. The words listed here are commonly found along with the verb forbid in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb FORBID.
absolutely, actually, entirely
equally, explicitly, expressly
peremptorily, positively, simply
specifically, strictly, utterly
Hope this word list had the forbid adverb you were looking for. In addition to adverbs used with forbid, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.