The phrase "not a little" is often used to indicate that something is more than just a little, but not necessarily a lot. Some synonyms for this phrase include "considerably," "quite a bit," "significantly," "substantially," and "notably." These words all convey a sense of a significant amount, but not an excessive one. Other similar phrases that can be used include "not insignificantly," "not inconsiderable," and "not small." When trying to express that something is more than just a little bit, but not quite a lot, it is important to choose the right words so that the message is conveyed accurately.