The phrase "to no small extent" suggests that something is significant or influential, but there are several other words that can convey a similar meaning. For example, "considerably" or "substantially" can be used to emphasize the size or magnitude of a thing or factor. "Significantly" can also be used to highlight the importance or impact of something, while "considerable" or "considerate" can emphasize the degree of attention or thoughtfulness given to a particular action or decision. Other synonyms for "to no small extent" include "quite a bit," "to a great degree," "much," and "largely." These words can be useful when trying to convey the degree to which something has affected or influenced a particular outcome.