Infusive is an adjective that describes something that permeates or spreads through something else. Synonyms for infusive include diffusive, penetrative, pervading, pervasive, interpenetrating, imbibing, and soaking. These words all convey a similar idea of something spreading through or saturating another thing. For example, a fragrance might be described as infusive if it imbues a room with its scent. Similarly, a chemical that penetrates deeply into a material might be described as diffusive. Whether you use infusive or one of its synonyms, the idea is the same: something is deeply penetrating and pervasive.