/ Thesaurus / H Synonyms of highly infective Find synonyms for: Adjective1. highly infective, virulent (vs. avirulent)usage: (of a microorganism) extremely infective; "a highly infective organism"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language