EFFECTIVE Synonyms: 196 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/effective
WEBSynonyms for EFFECTIVE: efficient, productive, potent, adequate, efficacious, effectual, operative, useful; Antonyms of EFFECTIVE: ineffective, useless, inefficient, ineffectual, unproductive, fruitless, inoperative, incapable.
DA: 15 PA: 62 MOZ Rank: 76