| loudmouth | (noun) a person who causes trouble by speaking indiscreetly | Synonyms: blusterer |
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| loudness | (noun) the magnitude of sound (usually in a specified direction) | Synonyms: intensity, volume |
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| (noun) tasteless showiness | Synonyms: brashness, flashiness, garishness, gaudiness, glitz, meretriciousness, tawdriness |
| loudspeaker | (noun) electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance | Synonyms: loudspeaker system, speaker, speaker system, speaker unit |
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| lough | (noun) Irish word for a lake | - |
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| (noun) a long narrow (nearly landlocked) cove in Ireland | - |
| lounge | (noun) a room (as in a hotel or airport) with seating where people can wait | Synonyms: waiting area, waiting room |
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| (noun) an upholstered seat for more than one person | Synonyms: couch, sofa |
| lounger | (noun) an armchair whose back can be lowered and foot can be raised to allow the sitter to recline in it | Synonyms: recliner, reclining chair |
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| (noun) an article of clothing designed for comfort and leisure wear | - |
| (noun) someone who wastes time | Synonyms: dallier, dilly-dallier, dillydallier, mope |
| loungewear | (noun) clothing suitable for relaxation | - |
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| loupe | (noun) small magnifying glass (usually set in an eyepiece) used by jewelers and horologists | Synonyms: jeweler's loupe |
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| 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 |
| lout | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lubber, lummox, lump, oaf, stumblebum |
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| loutishness | (noun) The state or quality of behaving like a troublemaker, often violent; like a rude violent person; like a yob. | - |
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| louvar | (noun) large silvery fish found worldwide in warm seas but nowhere common; resembles a whale and feeds on plankton | Synonyms: Luvarus imperialis |
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| louver | (noun) one of a set of parallel slats in a door or window to admit air and reject rain | Synonyms: fin, louvre |
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| louvre | (noun) one of a set of parallel slats in a door or window to admit air and reject rain | Synonyms: fin, louver |
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