There are several synonyms for the phrase "annoying insect". Some common options are "pesky bug," "irritating fly," "bothersome gnat," or "troublesome mosquito". Other substitutes might include "nagging aphid," "pestiferous fly," "exasperating tick," or "vexing flea". Depending on the specific type of insect causing irritation, there may be even more precise synonyms available; for example, "biting midge" or "stinging wasp". Regardless of which synonym you choose, it's clear that these pests can be a major nuisance and can interfere with our enjoyment of the great outdoors.