| lumbar | (adjective) of or relating to or near the part of the back between the ribs and the hipbones | - |
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| lumbering | (adjective) slow and laborious because of weight | Synonyms: heavy, ponderous |
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| lumbosacral | (adjective) of or relating to or near the small of the back and the back part of the pelvis between the hips | - |
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| luminescent | (adjective) emitting light not caused by heat | - |
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| luminous | (adjective) softly bright or radiant | Synonyms: aglow, lambent, lucent |
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| lumpen | (adjective) mentally sluggish | Synonyms: lumpish, unthinking |
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| lumpish | (adjective) mentally sluggish | Synonyms: lumpen, unthinking |
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| lumpy | (adjective) having lumps; not smooth and even in texture | - |
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| (adjective) like or containing small sticky lumps | Synonyms: chunky |