Which adjective describes something that is glaring, tastelessly showy, or overdecorated in a vulgar way?

The adjective that aptly describes something as glaring, tastelessly showy, or overdecorated in a vulgar way is "garish." This word conveys a sense of excessive brightness or flamboyance that can be unappealing or gaudy. It is often used to describe items or appearances that are ostentatious and lack refinement, highlighting a kind of visual assault that can be considered distasteful.

In contrast, "modest" refers to simplicity and a lack of ostentation, whereas "subtle" suggests a refined or understated quality that does not attract excessive attention. "Elegant" implies grace and refinement, often associated with beauty and a tasteful presentation. Therefore, while these alternatives carry their own distinctive meanings, they do not match the specific notion of excess and vulgarity captured by "garish."