Synonyms of costly in English:

costly


See US English definition of costly

See UK English definition of costly

See Spanish definition of costoso

adjective

1‘his work was published in small and costly editions’

SYNONYMS
expensive, dear, high-cost, high-priced, highly priced, big-budget, overpriced, exorbitant, extortionate, immoderate, extravagant
lavish, rich, deluxe, choice, fine, exquisite
valuable, priceless, worth its weight in gold, worth a king's ransom
British upmarket, over the odds
informal steep, pricey
ANTONYMS

cheap, inexpensive

2‘in those weather conditions any mistakes could be costly’

SYNONYMS
catastrophic, ruinous, disastrous, calamitous, cataclysmic, devastating, crippling, crushing, fatal, lethal, damaging, harmful, injurious, deleterious, woeful, grievous, lamentable, dire, awful, terrible, unfortunate
literary direful
ANTONYMS

beneficial