Downright and Dead-on

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

Dead-on and downright are semantically related. In some cases you can use "Dead-on" instead an adjective "Downright".

Dead-on adjective - Being in agreement with the truth or a fact or a standard.

Downright and dead-on are semantically related. Sometimes you can use "Downright" instead an adjective phrase "Dead-on".