| cumulonimbus | (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms | Synonyms: cumulonimbus cloud, thundercloud |
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| nimble | (adjective) moving quickly and lightly | Synonyms: agile, quick, spry |
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| (adjective) mentally quick | Synonyms: agile |
| nimbleness | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightness, lightsomeness |
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| (noun) intelligence as revealed by quickness and alertness of mind | Synonyms: mental dexterity |
| nimblewill | (noun) slender branching American grass of some value for grazing in central United States | Synonyms: Muhlenbergia schreberi, nimble Will |
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| nimbly | (adverb) in a nimble or agile manner; with quickness and lightness and ease | Synonyms: agilely |
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| nimbus | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, halo |
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| (noun) a dark grey cloud bearing rain | Synonyms: nimbus cloud, rain cloud |