"Sneaking suspicions" is a phrase that refers to a feeling of doubt or distrust that one has about something. The antonyms of this phrase could be "confidence" or "certainty", which means having a firm belief in something without any doubt or hesitation. Other antonyms of "sneaking suspicions" could be "assurance", "conviction", or "trust", which all imply a strong feeling of faith and reliance on something. In contrast, "sneaking suspicions" can also be opposed by "clarity" or "transparency", meaning a lack of ambiguity or hidden intention that would otherwise lead to suspicion.