Antonyms of verb certify

1 of 5 senses of certify

Sense 3
license, licence, certify -- (authorize officially; "I am licensed to practice law in this state")
       Antonym of decertify (Sense 1)
      => decertify, derecognize, derecognise -- (cause to be no longer approved or accepted; "Carter derecognized Taiwan in 1979 after the U.S. recognized the People's Republic of China")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb certify

5 senses of certify

Sense 1
attest, certify, manifest, demonstrate, evidence -- (provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness")
       => testify, bear witness, prove, evidence, show -- (provide evidence for; "The blood test showed that he was the father"; "Her behavior testified to her incompetence")

Sense 2
certify -- (guarantee payment on; of checks)
       => secure -- (assure payment of)

Sense 3
license, licence, certify -- (authorize officially; "I am licensed to practice law in this state")
       => authorize, authorise, pass, clear -- (grant authorization or clearance for; "Clear the manuscript for publication"; "The rock star never authorized this slanderous biography")

Sense 4
certify, endorse, indorse -- (guarantee as meeting a certain standard; "certified grade AAA meat")
       => guarantee, warrant -- (stand behind and guarantee the quality, accuracy, or condition of; "The dealer warrants all the cars he sells"; "I warrant this information")

Sense 5
certify -- (declare legally insane)
       => declare, adjudge, hold -- (declare to be; "She was declared incompetent"; "judge held that the defendant was innocent")