Definition of insubstantial

The word "insubstantial" originated in the Middle English language during the 14th century. At the time, it was spelled "insustanciall" and was derived from the Old French word "insustancial" which meant "unsubstantial" or "not standing under." In Old French, "sustancia" referred to the concept of substance or essence, which was a central concept in medieval philosophy. "Insustancia" (literally, "not substance") was used to describe things that lacked this essential quality, such as illusions, dreams, or ghosts. The word made its way into Middle English during the 14th century, and its meaning remained relatively unchanged. Over time, it became more commonly used to describe intangible or ephemeral things, such as ideas, feelings, or weather. Today, the word "insubstantial" is still commonly used in English with its original meaning of lacking substance or density. It can be used to describe things that are fragile, intangible, or fleeting, as well as people who appear weak or unsubstantial.