You're only a 6-year-old!" is being condescending. The Latin prefix con- means "with," and the Latin word for descend means "down," so the word condescending probably developed to describe someone who looked down on others.

What is the root word of condescending?

The first records of the word condescend come from the 1300s. It comes from the Late Latin condēscendere, which means “to stoop” and derives from the Latin dēscendere, “to descend.” Condescending always involves stooping or descending to the level of those considered inferior.

What type of word is condescending?

Condescending is most commonly used as an adjective, but it's also the continuous tense (-ing form) of the verb condescend, which most commonly means to act in this way. The act of doing so is called condescension.