costless

Adjective

Synonyms: complimentary free gratis(p)gratuitous

WordNet 3.0

Adjective (1)

costing nothing“complimentary tickets”“free admission”Synonyms: complimentary free gratis(p)gratuitous

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Webster's Dictionary (GCIDE)

Costless \Cost"less\ (k?st"l?s; 115), a. Costing nothing. [1913 Webster]

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