inefficaci

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inefficac.i          ADJ    3 1 DAT S X POS             
inefficac.i          ADJ    3 1 ABL S X POS             
inefficax, inefficacis (gen.), inefficacior -or -us, inefficacissimus -a -um  ADJ   [XXXCO]  
useless, ineffectual, unavailing, achieving nothing;
invalid (legal), inoperative; not potent/efficacious (remedies), ineffective;