Nerdy and Witless

Nerdy adjective - Much given to learning and thinking.

Witless and nerdy are semantically related. in foolish topic. In some cases you can use "Witless" instead an adjective "Nerdy", when it comes to topics like nonsensical.

Witless adjective - Not having or showing an ability to absorb ideas readily.

Nerdy and witless are semantically related. You can use "Nerdy" instead an adjective "Witless".