/ Thesaurus / I Synonyms of intruder Find synonyms for: Noun1. intruder, interloper, trespasser, entrant, unwelcome person, persona non gratausage: someone who intrudes on the privacy or property of another without permissionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language