Select the most appropriate ANTONYM of the underlined word in the given sentence.

It is important to verify the credibility of an online master's program.

improbability

The most appropriate antonym of the underlined word credibility in the given sentence is improbability.

• Credibility means "the quality of being believable or trustworthy."
• Improbability means "the quality of being unlikely or improbable."

The other words do not have the same meaning as credibility, so they are not its antonyms.

• Serenity means "calmness or peacefulness."
• Integrity means "the quality of being honest and having strong moral principles."
• Accuracy means "the quality of being correct or precise."