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adjectivelacking the power to produce a desired effectOpposite:
Words sounding like good inefficacious
gracious spacious tenacious voracious cretaceous flirtatious audacious salacious vivacious efficacious ignatius argillaceous rapacious capacious athanasius curvaceous fallacious crustaceous sagacious herbaceous ungracious perspicacious pugnacious loquacious carbonaceous mendacious disputatious coriaceous sebaceous veracious