Featherheaded and Surd

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

Surd and featherheaded are semantically related. In some cases you can use "Surd" instead an adjective "Featherheaded".

Surd adjective - Produced without vibration of the vocal cords.

Featherheaded and surd are semantically related. Sometimes you can use "Featherheaded" instead an adjective "Surd".