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Adjective: costless  kóst-lus
  1. Costing nothing
    "costless tickets";
    - complimentary, free, gratis, gratuitous, courtesy

See also: unpaid

Nearest

cost-benefit analysis
cost-effective
cost-efficient
coster
costermonger
costia
Costia necatrix
costiasis
costing
costive
costless
costliness
costly
costmary
costoaxillary vein
costochondritis
cost-of-living adjustment
cost-of-living allowance
cost-of-living benefit
cost-of-living index
cost-plus