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The service was gratuitous, so we didn't have to pay anything.
Given or done free of charge; not required or necessary.
The meal was gratuitous, so we enjoyed it without any cost.
They offered gratuitous advice on how to improve our project.
The tickets were gratuitous, allowing everyone to attend the concert for free.
gratuitous service
gratuitous advice
gratuitous benefits
free
complimentary
unnecessary