Consistency is among the keys of a trustworthy person. It is possible to trust a person in some areas or with some responsibilities but not in. While becoming a trustworthy person isn't something that can happen overnight, there are a few things that you can start doing differently in order to develop. Proverbs says, “Many people claim to be loyal, but it is hard to find a trustworthy person ” (NCV). That was written thousands of years ago.