Main entry: invalid
Definition: having no cogency or legal force
Usage: invalid reasoning; an invalid driver's license
Antonyms: valid
Definition: well grounded in logic or truth or having legal force
Definition: that which is pleasing or valuable or useful
Antonyms: good
Definition: having desirable or positive qualities especially those suitable for a thing specified
Antonyms: true
Definition: consistent with fact or reality; not false
Antonyms: sound
Definition: financially secure and safe
Antonyms: sound
Definition: in good condition; free from defect or damage or decay
Main entry: invalid
Definition: no longer valid
Usage: the license is invalid
Antonyms: unexpired
Definition: not having come to an end or been terminated by passage of time