What does costless mean?
Costless is an adjective describing something that costs nothing — whether that means requiring no money, as in a costless download, or involving no loss, effort, or penalty, as in a costless decision. It is formed simply from the noun 'cost' plus the suffix '-less', and has been part of English since at least the sixteenth century. Though its meaning overlaps with 'free', the two are not fully interchangeable: 'free' is by far the more common everyday choice, while 'costless' tends to appear in slightly formal, commercial, or technical contexts where the writer wants to emphasise precisely the absence of expense rather than freedom of access. It can also carry a figurative force, suggesting that an action carries no downside or sacrifice. Antonyms such as 'costly' and 'expensive' mark the contrast clearly, making 'costless' a useful, precise term in pricing, economics, and general description alike.
Costing nothing; free of charge.
"Admission to the exhibition is costless on Sundays."
Slightly more formal than 'free'; common in commercial and promotional writing.
(Figurative) Involving no loss, effort, or disadvantage.
"For her, apologising first was a costless way to end the quarrel."
It sounds like marketing-speak, but 'costless' has been part of English since at least the sixteenth century.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of costless
Costless derives from the Middle English noun 'cost', meaning price or expense, combined with the suffix '-less'. The noun 'cost' ultimately traces back to the Latin verb 'constare', meaning 'to stand together' and hence 'to amount to, to cost'. The adjective has been in use since at least the sixteenth century, with its core sense of 'free of charge' stable throughout its history.
How costless is actually used
'Costless' is somewhat less common than 'free' in everyday speech and carries a slightly formal or commercial register; it often appears in advertising and business writing where precision about price matters. The figurative sense (no downside or sacrifice) is well established.