The term "wishy-washy" describes someone or something that is indecisive, weak, or lacking in firmness or clarity. It can refer to a person's opinions or actions that seem uncertain or half-hearted, making it difficult to take a firm stand or make a strong decision. In essence, when somebody is described as wishy-washy, it implies they are not confident, clear, or committed in their beliefs or choices.
The term "wishy-washy" originated in the early 20th century, likely deriving from the combination of "wishy," a variant of "wish," meaning weak or ineffective, and "washy," referring to being watery or lacking in substance. The phrase paints a picture of something that lacks depth or strength, much like diluted water.