What is the opposite of invalid?

Need antonyms for invalid? Here's a list of opposite words from our thesaurus that you can use instead.

Opposite of lacking in accuracy or truth
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Opposite of regularly or chronically in poor health
Opposite of not legally valid or binding
Opposite of showing a lack of common sense
“The donkey is incapable of forming a rational decision as there is no motive to choose one bale of hay over the other.”
Opposite of affected by a disease or illness
“After a challenging phase in his life, Grant was finally feeling healthy again.”
Opposite of not working or taking effect
Opposite of a person in receipt of medical treatment
“He is currently being treated by a doctor as he recovers from illness.”
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