mala fidePronunciation: /ˌmeɪlə ˈfʌɪdiː, ˌmalə ˈfiːdeɪ/Definition of mala fide adjective & adverb Law in bad faith; with intent to deceive: [as adjective]:a mala fide abuse of positionOrigin:Latin, ablative of mala fidesmala fide in other Oxford dictionaries Definition of mala fide in the US English dictionary