unsubstantially

This adverb is primarily used in formal, technical, or legal contexts to describe a lack of significance or physical robustness. When referring to quantity or value, it functions as a precise antonym to substantially, indicating that while a change occurred, it was too small to be meaningful or impactful.

In a structural context, the word describes a lack of stability or durability. It suggests a precarious state, often implying that something was constructed poorly or with inadequate materials, leading to a high risk of failure or collapse.