The phrase "reliant on" can be replaced with a variety of synonyms to convey the same meaning. For instance, "dependent on" or "reliable on" can be used to show that an individual or situation is reliant on something or someone. "Contingent on" and "hinging on" are other useful synonyms that can be used in the same context. "Supported by" and "relying upon" can also be used to indicate that a person has some form of dependence on another. Finally, one can use "subject to" and "vulnerable to" to denote situations in which an individual has limited control and must rely on others.