costly

C3O1S1T1L1Y4
UK/ˈkɒst.li/

adjective

Of high cost; expensive.

“a costly error”

Opposite
CommonScrabble 11

Meanings

adjectivecostly (comparative costlier or more costly, superlative costliest or most costly)

comparative costlier · comparative more costly · superlative costliest · superlative most costly

  1. Of high cost; expensive.

    a costly error

    4 more examples

    a costly activity

    In the early days troubles were experienced with oscillation from the rod drive and with the transformers, but were overcome later, and these machines performed useful service until superseded by more modern locomotives less costly in maintenance.

    1960 December 28, Cecil J. Allen, “Operating a mountain main line: the Bern-Lötschberg-Simplon: Part One”, in Trains Illustrated, page 743

    Individual mistakes proved costly for Wigan who, particularly after the half-time introduction of Hugo Rodallega, dominated for long periods.

    2011 October 15, Michael Da Silva, “Wigan 1 - 3 Bolton”, in BBC Sport

    Since sexual relationships are more costly for female primates – they bear the kids – females are the choosier sex.

    2012 March 2, Elizabeth Landau, “Beholding beauty: How it’s been studied”, in CNN

    Synonyms: dear, expensive, prohibitive

nouncostly (uncountable)
  1. abbreviationuncountablecard gamesShort for costly colours.

    Costly is a simpler game than cribbage.

Synonyms & antonyms

adjectiveOf high cost; expensive.

Opposite

More synonyms by meaning

adjectiveentailing great loss or sacrifice

Similar
dearly-wonexpensive

adjectivehaving a high price

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Middle Englishcostly
  2. Englishcostly

From Middle English costly, costely, costeley, equivalent to cost + -ly.

Full word history & related roots →

Translations

Ancient Greek πολυτελής
  • πολυτελής (polutelḗs)expensive
Bulgarian скъп, це́нен
  • скъп (skăp)expensive
  • це́нен (cénen)expensive
Catalan costós
  • costósexpensive
Dutch prijzig, duur
  • prijzigexpensive
  • duurexpensive
  • kostbaarexpensive
Esperanto multekosta, altepreza
  • multekostaexpensive
  • alteprezaexpensive
Finnish hintava, kallis
  • hintavaexpensive
  • kallisexpensive
French coûteux, lourd
  • coûteuxexpensive
  • lourdexpensive
German teuer, kostspielig
  • teuerexpensive
  • kostspieligexpensive
Icelandic kostnaðarsamur
  • kostnaðarsamurexpensive
Irish luachmhar, costasach
  • luachmharexpensive
  • costasachexpensive
  • costasúilexpensive
Italian costoso, caro
  • costosoexpensive
  • caroexpensive
  • dispendiosoexpensive
Latin pretiōsus, impensus
  • pretiōsusexpensive
  • impensusexpensive
Latvian dārgs
  • dārgsexpensive
Polish kosztowny
  • kosztownyexpensive
Portuguese custoso, caro
  • custosoexpensive
  • caroexpensive
Romanian costisitor, scump
  • costisitorexpensive
  • scumpexpensive
Russian дорогосто́ящий, дорого́й
  • дорогосто́ящий (dorogostójaščij)expensive
  • дорого́й (dorogój)expensive
  • це́нный (cénnyj)expensive
Scottish Gaelic cosgail
  • cosgailexpensive
Spanish costoso, caro
  • costosoexpensive
  • caroexpensive
Swedish dyr, kostsam
  • dyrexpensive
  • kostsamexpensive
Cite this entry
APA

costly. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/costly

MLA

“costly.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/costly. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “costly,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/costly.

Source: costly on Wiktionary, CC BY-SA 4.0.