Current
Useful, valid.
worn, stale, tired, old, exhausted, obsolete, passe, rotten,
If you mean opposite gender, then the answer is manager.The noun 'manageress' is an obsolete word for a manager who is female.The noun 'manager' is a common gender noun, a word for a male or a female in charge.
Obsolete is an adjective.
The antonym of the word 'synonym' is 'antonym'.
OB is the abbreviation for obsolete.
dinosaurs are obsolete.
obsolete
An antonym means "opposite". So an antonym for the word synonym is antonym.
obsolete
Card readers are obsolete.
it was obsolete by the invention of the gun