| synonyms (adjective) effective (adjective) efficacious (adjective) legal (adjective) sound | antonyms (adjective) ineffective | related terms (adjective) efficacious (adjective) efficient (adjective) potent (adjective) powerful (adjective) stiff (adjective) strong (adjective) useful (adjective) utile | similar terms (adjective) hard-hitting (adjective) impelling (adjective) impressive (adjective) rough-and-ready (adjective) telling (adjective) trenchant (adjective) valid |
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