Costing nothing.

synonyms: complimentary, free, gratis, gratuitous.

Roget 815: cheap; low, low priced; moderate, reasonable; inexpensive, unexpensive^†; well worth the money, worth the money; magnifique et pas cher [Fr.]; good at the price, cheap at the price; dirt cheap, dog cheap; cheap, cheap as dirt, cheap and nasty; catchpenny; discounted etc. 813.    half-price, depreciated, unsalable.    gratuitous, gratis, free, for nothing; costless, expenseless^†; without charge, not charged, untaxed; scotfree, shotfree^†, rent-free; free of cost, free of expense; honorary, unbought, unpaid.    ... show more

Polish: bezpłatny, darmowy, nieodpłatny