bona fides
[noun]
Synonyms: good faith, sincereness, sincerity, uberrima fides

[TahlilGaran] English Synonym Dictionary ▲

bona fi‧des /ˌbəʊnə ˈfaɪdiːz $ ˌboʊnə-, ˈboʊnə faɪdz/ noun [plural] British English
[Date: 1800-1900; Language: Latin; Origin: 'good faith']
if you check someone’s bona fides, you check that they are who they say they are, and that their intentions are good and honest

[TahlilGaran] Dictionary of Contemporary English ▲