Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-multus, a, um, adj., very much, very many (class.): nescio quantulum attulerit; verum haud permultum attulit, Plaut. Bacch. 2, 3, 86: imitatores, Cic. Leg. 3, 14, 31: colles, Caes. B. C. 3, 43: permultum erit ex maerore tuo diminutum, Cic. Fam. 5, 16, 5: permultum interest, utrum, etc., id. Off. 1, 8, 27: permulta rogatus Fecit, Hor. S. 1, 4, 97.
Hence, adv.