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From The Collaborative International Dictionary of English v.0.48:
Unlucky \Un*luck"y\, a. 1. Not lucky; not successful; unfortunate; ill-fated; unhappy; as, an unlucky man; an unlucky adventure; an unlucky throw of dice; an unlucky game. [1913 Webster] Note: This word is properly applied to incidents in which failure results from chance or fortuity, as in games of hazard, rather than from lack or feebleness of effort. [1913 Webster] 2. Bringing bad luck; ill-omened; inauspicious. [1913 Webster] Haunt me not with that unlucky face. --Dryden. [1913 Webster] 3. Mischievous; as, an unlucky wag. [Colloq.] [1913 Webster]