The antonyms for the phrase "hadst faith in" include mistrust, doubt, disbelief, skepticism, suspicion, and uncertainty. Mistrust refers to a lack of confidence or belief in someone or something. Doubt means an uncertainty or lack of conviction in a fact, proposition, or statement. Disbelief denotes a complete lack of faith or confidence in someone or something. Skepticism implies a questioning attitude or doubt towards a belief or a claim. Suspicion refers to a feeling of doubt or mistrust towards someone's actions, behavior or motives. Uncertainty denotes a lack of conviction or confidence due to lack of information, knowledge or experience.