| clandestine | (adjective) conducted with or marked by hidden aims or methods | Synonyms: cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground |
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| clanging | (adjective) having a loud resonant metallic sound | Synonyms: clangorous |
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| clangorous | (adjective) having a loud resonant metallic sound | Synonyms: clanging |
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| clanking | (adjective) having a hard nonresonant metallic sound | - |
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| clannish | (adjective) characteristic of a clan especially in being unified | - |
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| (adjective) befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior | Synonyms: cliquish, clubby, snobbish, snobby |