Handwavy

Handwavy is an informal term used to describe an explanation or argument that lacks rigor or detail. It typically refers to a situation where a concept is introduced or discussed without providing the necessary evidence, mathematical derivation, or logical steps to support it. Instead, the explanation relies on intuition, analogy, or a general assertion of correctness.

The term "handwavy" is often employed in scientific and academic contexts, particularly when discussing complex theories or experimental results. It can be used critically to point out a perceived weakness in an argument, suggesting that the presenter has glossed over important details or made unsubstantiated claims. For example, a physicist might describe a solution to a problem as "handwavy" if it bypasses a difficult mathematical calculation by simply stating that the result is expected to be a certain way.

While often used pejoratively, handwavy explanations can sometimes serve a purpose. In introductory settings, they can provide a conceptual overview or intuition before delving into more formal treatments. They can also be a starting point for further investigation, prompting others to fill in the missing details. However, in formal presentations or publications, handwaving is generally discouraged in favor of precise and well-supported arguments. The effectiveness of a handwavy explanation depends heavily on the audience's existing knowledge and the context of the discussion.