Invalid and Sick as a dog

Invalid adjective - Chronically or repeatedly suffering from poor health.

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

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

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