costly

word

Definition

Something that is costly is very expensive or requires a lot of resources, effort, or loss.

Usage & Nuances

'Costly' is formal and commonly used for expensive mistakes, decisions, or items. Often used in phrases like 'costly mistake' (with serious negative effects). Do not use for everyday cheap/expensive comparisons—use 'expensive' instead.

Example Sentences

This watch is too costly for me to buy.

basic

Trying to cut corners ended up being more costly than doing it right the first time.

natural

Building a house can be costly.

basic

A costly mistake can change your life.

basic

His decision to ignore the warnings proved to be costly.

natural

Repairs on that old car have become really costly over time.

natural