The phrase "is dependent" can be replaced by several synonyms to convey the same meaning. Some of the synonyms for "is dependent" include "relies on," "needs," "requires," "is reliant on," "hinges on," "is contingent upon," "is conditional upon," "hangs on," "rests on," "is determined by," and "is influenced by." Each of these synonyms can be used to indicate a situation in which something or someone is reliant on another thing or person to function properly. Whether discussing relationships, economics, or biology, using synonyms for "is dependent" can add clarity and depth to writing.