| louse | (noun) wingless usually flattened bloodsucking insect parasitic on warm-blooded animals | Synonyms: sucking louse |
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| (noun) any of several small insects especially aphids that feed by sucking the juices from plants | Synonyms: plant louse |
| (noun) wingless insect with mouth parts adapted for biting; mostly parasitic on birds | Synonyms: bird louse, biting louse |
| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, insect, worm |
| lousiness | (noun) the quality of being disgusting to the senses or emotions | Synonyms: loathsomeness, repulsiveness, sliminess, vileness, wickedness |
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| (noun) infestation with lice (Pediculus humanus) resulting in severe itching | Synonyms: pediculosis |
| lousy | (adjective) very bad | Synonyms: crappy, icky, rotten, shitty, stinking, stinky |
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| (adjective) infested with lice | - |
| (adjective) vile; despicable | Synonyms: dirty, filthy |