Downright and Flats

Downright adjective - Being or characterized by direct, brief, and potentially rude speech or manner.

Flats and downright are semantically related In some cases you can replace term "Flats" with "Downright", this adjectives are similar.

Flats noun - Footwear (shoes or slippers) with no heel (or a very low heel).

Downright and flats are semantically related in absolute topic. Sometimes you can use "Downright" instead an adjective "Flats".