| Infest 1. (v. t.) To inhabit or trouble in large numbers; as rats infest a city; to disturb; to annoy; to frequent and molest or harass; as, fleas infest dogs and cats; a sea infested with pirates. 2. (v. t.) Mischievous; hurtful; harassing. Thesaurus Entries beset, crawl with, creep with, flood, infiltrate, inundate, invade, overrun, overspread, overswarm, penetrate, permeate, pervade, plague, ravage, swarm, swarm over, swarm with |