Invalid and Surd

Invalid adjective - Chronically or repeatedly suffering from poor health.

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

Nearby Words: invalidate, invalidated, invalidity, invalided, invalidation

Surd adjective - Produced without vibration of the vocal cords.

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