An expression of farewell

अलविदा

English Usage: They said their goodbyes at the airport.

Hindi Usage: उन्होंने एयरपोर्ट पर अलविदा कहा।

Having positive or desirable qualities

अच्छा

English Usage: That's a good idea for the project.

Hindi Usage: यह परियोजना के लिए एक अच्छा विचार है।

To bid farewell

अलविदा कहना

English Usage: They will goodbye before leaving.

Hindi Usage: वे जाने से पहले अलविदा कहेंगे।