What's the adjective for credential? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs credence, credential, credit and creed which may be used as adjectives within certain contexts.
“After each labor, he would come home tired, but feeling that he had done a creditable day's work.”
“The credible eyewitness testimony provided by the victim was extremely creditable, strengthening the case against the accused.”
“After conducting thorough research and gathering relevant evidence, the lawyer presented a creditable argument to prove that the liability could be assigned to the defendant.”