Definition of "costliest" [costliest]

• Superlative form of costly: most costly. (adjective)

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• "It is not their costliest car; their costliest is the Corniche, then the Carmargue."
• "The costliest was the July 2008 seizure of big California lender IndyMac Bank, on which the insurance fund is estimated to have lost $10.7 billion."
• "The costliest is a $19.4 million effort to stabilize and clean first floors and tunnels in a number of campus buildings."