Fiducially is a term that pertains to trust and confidence, but there are several synonyms that can be used interchangeably with the word. One such term is "religiously," which implies a deep level of commitment and dedication. "Faithfully" is another synonym that is often used in legal and contractual contexts, indicating a promise to abide by certain rules or obligations. Similarly, "dependably" suggests a reliable and consistent level of trustworthiness, whereas "loyally" conveys a sense of steadfastness and devotion to a particular cause or person. Overall, these synonyms for "fiducially" provide valuable options for expressing trust and confidence in various contexts.