Overdilute is a term that describes the act of adding too much liquid to a solution, which results in a weakened concentration. There are a variety of synonyms for this word, including dilute, thin, weaken, and dilute excessively. Other synonyms include water down, weaken excessively, adulterate, sap, and asperse. These words all convey a sense of diminishing the potency of a substance by adding too much liquid to it. When a solution is overdiluted, it can be difficult to achieve the desired effect, as the strength of the solution has been compromised. It is important to carefully measure and mix solutions to avoid overdilution.