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Comprehensive
Dictionary Suite
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abortive failing to achieve a desired end; unsuccessful; fruitless. [1/3 definitions]
blind alley (informal) a fruitless or unproductive undertaking, idea, or line of inquiry. [1/2 definitions]
sterile lacking ideas, results, vitality, or the like; impotent; fruitless. [1/4 definitions]
vain not leading to a desirable or lasting effect; futile; fruitless. [1/4 definitions]