costly

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

• (Received Pronunciation) IPA^(key): /ˈkɒst.li/

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costly (comparative costlier, superlative costliest)

1. Of high cost; expensive.

   a costly activity

   a costly error

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

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

• costlessly

• octyls