Unflashy is an adjective used to describe something that is not showy, flashy, or attention-grabbing. In antonym, it refers to a completely opposite meaning of the word. Some of the antonyms for unflashy include flashy, striking, flamboyant, garish, loud, ostentatious, and vivid. If you are looking for a way to describe something that is vibrant, showy, or bright, then choosing an antonym of unflashy will help you to convey a completely different meaning. Whether you are describing a piece of clothing, a piece of art, or a person's personality, choosing the right antonym can help you to fully capture what you are trying to communicate.