Preposterous and Wacky

Preposterous adjective - Conceived or made without regard for reason or reality.

Wacky is a synonym for preposterous in ability topic. In some cases you can use "Wacky" instead an adjective "Preposterous", when it comes to topics like ridiculous.

Wacky adjective - Showing or marked by a lack of good sense or judgment.

Preposterous is a synonym for wacky in ability topic. Sometimes you can use "Preposterous" instead an adjective "Wacky", if it concerns topics such as acting crazy.