valid

/ˈvælɪd/
adjective
  1. Legally or officially acceptable; having legal force.
    • You need a valid passport to travel internationally.
    • Is your driver's license still valid?
    • The coupon is valid until the end of the month.
  2. Based on truth or reason; able to be accepted.
    • The teacher said my reasoning was valid and gave me full credit.
    • His argument was not valid because it relied on incorrect data.
    • She made a valid point about the need for more parks in the city.
Antonyms