The word "theistically" refers to something pertaining to the belief in the existence of one or more gods or a deity. Some synonyms for "theistically" include "religiously", "spiritually", and "devoutly". These words all connote a strong belief in a higher power or divine being. Another synonym for "theistically" could be "faithfully", which denotes a strong sense of trust and loyalty towards a particular religion or religious doctrine. It could also be described as "theocentrically", which emphasizes a focus on God as the center of one's beliefs and practices. Overall, all of these synonyms highlight a deep commitment and reverence towards a higher power.