What is the opposite of be effective?

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Contexts To stop operating To fail suddenly and completely Verb ▲ To stop operating fail break crash malfunction stop collapse die stall bomb cease terminate bust vitiate idle spoil compromise damage pause endamage halt weaken attenuate discontinue degrade interrupt yield act up be damaged be defective be faulty break down stop working give out give up give way go wrong play up shut off be unusable bite the dust cease to function cease to work cut short fall over go down develop a fault go haywire go kaput go phut pack up seize up conk out cut off cut out give in go to pieces be on the blink give up the ghost go on the blink “The machine would fail after one of our staff accidentally spilled coffee onto its internal components.” Verb ▲ To fail suddenly and completely collapse fail founder fold end fizzle flop fluff tank bomb crater flag flatline flounder flunk miscarry terminate languish break down fall flat fall through be frustrated not succeed be unsuccessful fall short flame out go wrong be in vain fizzle out go awry come to grief come unstuck go belly-up lack success miss the mark be found deficient be found wanting come a cropper come to a halt come to naught come to nothing turn out badly fall by the wayside be found lacking come apart at the seams go down like a lead balloon go to pieces foul up screw up slip up trip up “Peace talks between the two states would ultimately collapse.” Find more words! 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Words that rhyme with be effective Use our Antonym Finder Nearby Words be efficacious beefhead beefier beefiest beefily beefiness beefed up beefed beefcake beef about beef be ecstatic