What is the definition of Vivid Language?

A "vivid Word choice" means you picked very descriptive or vivid Words as adjectives (descriptors). Vivid Words are mostly associated with adjectives, but strong verbs can also be vivid Words.

Boring sentence: The wind scared Mary.

Vivid descriptions: The howling wind terrified Mary who swore she saw a pack of thick-furred wolves hovering near the campsite.