The two most common English pronunciations of “bona fide,” according to the six standard dictionaries we’ve consulted, are BOH-nuh-fied (the end rhymes with “fried”), and boh-nuh-FYE-dee (the end rhymes with “tidy”).

The pronunciation /ˈboʊnə.faɪd/, is the most common one in the USA and therefore listed first in American dictionaries, incl. American Heritage, Merriam-Webster, Webster's Third New International Dictionary, and the American version of Collins.