costly

adjective

KAWST-lee/ˈkɔst.li/UKKOST-lee/ˈkɒst.li/

1 meaning of costly

1
adjective
Needing a lot of money to buy, use, or fix.
Like a game that eats up all the coins you saved before you can win.
Fixing the broken roof turned out to be very costly.
Flying first class is much costlier than sitting in coach.
Similarexpensive, pricey, dear
Oppositecheap, inexpensive

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Origin

From Middle English costly, made from cost plus -ly.