Invalid and Sick as dog

Invalid adjective - Chronically or repeatedly suffering from poor health.

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

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

Invalid and sick as dog are semantically related in sick topic. Sometimes you can use "Invalid" instead an adjective phrase "Sick as dog", if it concerns topics such as not healthy.