| fluke | (noun) parasitic flatworms having external suckers for attaching to a host | Synonyms: trematode, trematode worm |
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| (noun) either of the two lobes of the tail of a cetacean | - |
| (noun) flat bladelike projection on the arm of an anchor | Synonyms: flue |
| (noun) a barb on a harpoon or arrow | - |
| (noun) a stroke of luck | Synonyms: good fortune, good luck |
| flukey | (adjective) subject to accident or chance or change | Synonyms: chancy, fluky, iffy |
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| fluky | (adjective) subject to accident or chance or change | Synonyms: chancy, flukey, iffy |
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| lukewarm | (adjective) feeling or showing little interest or enthusiasm | Synonyms: half-hearted, halfhearted, tepid |
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| (adjective) moderately warm | Synonyms: tepid |
| lukewarmly | (adverb) in an unenthusiastically lukewarm manner | Synonyms: tepidly |
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| lukewarmness | (noun) a warmness resembling the temperature of the skin | Synonyms: tepidity, tepidness |
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| (noun) lack of passion, force or animation | Synonyms: tepidness |