In English, costly describes something that requires a high price, either in money, time, effort, or risk. This guide explains the core meaning, typical contexts, and nuances of costly, showing how the word signals that an outcome may be expensive beyond its price tag. Readers will find concise definitions, example sentences, common synonyms and contrasts, and practical guidance on when cautious or formal alternatives may be more suitable.
Core Meaning and Definition of Costly
At its simplest, costly means demanding a high price or large expenditure. In everyday use, costly often refers to financial expense, but it can also describe time, effort, opportunity, or risk. A purchase, decision, or action labeled costly is understood to require significant resources or to carry serious consequences. The term is commonly used to signal that something is not only expensive to acquire, but potentially difficult to justify or hard to replace.
Dictionary Definitions and Register
In general-purpose English dictionaries, costly is defined as high in price or value, or entailing serious or damaging consequences. The word carries a moderately formal to neutral register, making it suitable for both everyday speech and professional writing. It is widely recognized across varieties of English, though tone and emphasis can shift slightly depending on context and collocation. Costly remains a versatile adjective with enduring relevance.
Plain-language breakdown
- Basic sense: Requiring a large amount of money or resources.
- Extended sense: Entailing significant time, effort, risk, or downside.
- Connotation: Generally negative, because it implies sacrifice, loss, or regret.
Practical Examples in Everyday Use
Using costly in context helps clarify the range of situations the word describes. It can refer to physical purchases, lifestyle choices, investments, mistakes, or delays. Below are concise, realistic examples showing how costly appears in both everyday and formal scenarios.
- Buying an unreliable car may prove costly when frequent repairs add up.
- Delaying routine maintenance was a costly mistake for the factory.
- The project’s design changes were costly in both time and budget.
- Ignoring early warning signs can lead to a costly failure later on.
- Moving home for a short lease can be costly once fees and deposits are added.
Synonyms, Near-Synonyms, and Contrasting Terms
Choosing the right word often depends on whether the emphasis is on price, consequence, or effort. While costly strongly conveys high expense or serious impact, other words highlight slightly different aspects.
| Word | Nuance | Best Used For |
|---|---|---|
| expensive | High price in money | Goods and services |
| high-priced | Premium cost | Retail and listings |
| pricey | Informal emphasis on cost | Casual conversation |
| dear | Formal or elevated cost | Formal writing and older registers |
| extravagant | Unnecessarily high spending | Judgement about excess |
| prohibitively priced | Too expensive to afford | Affordability barrier |
| resource-intensive | Heavy use of time or effort | Projects and processes |
| risky | Likelihood of negative outcome | Decisions and actions |
Collocations and Common Phrases with Costly
Costly often appears with certain verbs, nouns, and modifiers that reinforce its meaning. Recognizing these patterns makes the word easier to use and understand in context.
- Costly mistake, costly error, costly oversight
- Costly decision, costly choice, costly misstep
- Costly delay, costly setback, costly consequence
- Costly to produce, costly to repair, costly to maintain
- Prove costly, turn out to be costly, end up costly
- Highly costly, very costly, rather costly, unexpectedly costly
Costly in Formal and Professional Contexts
In business, policy, and technical writing, costly is used to emphasize financial exposure, resource intensity, or risk. It helps writers explain why an outcome matters beyond immediate price.
- Budget impact: The error proved costly, requiring unplanned reallocation of funds.
- Operations: Downtime was costly in both lost output and overtime pay.
- Risk management: Shortcuts appeared efficient but carried a costly long-term risk.
- Procurement: The system’s low upfront price proved costly once customization needs were clarified.
Common Mistakes and Misunderstandings
Learners sometimes overapply costly or confuse it with mere price labels. Clear usage depends on recognizing when the stakes are broader than purchase price.
- Using costly only for luxury items: Inaccurate, because costly applies to necessary and inexpensive-seeming choices with large downsides.
- Confusing costly with harmful: Costly emphasizes resource loss, not direct injury; avoid pairing it with physical harm unless metaphorical.
- Overstating consequence unintentionally: Not every expensive purchase is costly; reserve the term for situations where the outcome is regrettable or significant.
When to Choose Costly Over Other Terms
Use costly when you want to highlight that an expense or action leads to disproportionate loss or difficulty. If the focus is purely on purchase price, terms like expensive or high-priced may be more neutral. When emphasizing social display, consider extravagant. For affordability barriers, prefer prohibitively priced.
Quick guidance
- Choose costly when consequences matter beyond price.
- Use expensive for neutral descriptions of price.
- Use pricey or dear for informal or formal emphasis on cost, respectively.
- Use costly to underscore regret, risk, or resource intensity.
Regional and Register Notes
Although spelling and core meaning are consistent across major English varieties, slight differences in frequency and tone exist. In British English, costly can carry a slightly more formal or old-fashioned feel, while in American English it remains current in both spoken and written registers. The term is common in journalism, business reporting, and technical documentation, where precise distinctions between price and broader impact are important.
Summary and Quick Takeaways
- Costly means high in price, time, effort, or risk, not merely high in purchase price.
- It often implies negative consequences, regret, or the need to justify the expense.
- Useful in both everyday and formal contexts, especially when explaining why something matters beyond its tag price.
- Watch for contexts where broader consequences distinguish costly from simpler synonyms like expensive.
Understanding costly in full helps writers and readers communicate not only that something requires significant resources, but that the price is meaningful within a broader context of value, risk, and outcome.