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The phrase "are extremely expensive" is correct and usable in written English.
You can use it when discussing the high cost of items or services.
Example: "Luxury cars are extremely expensive, often costing more than a small house."
Alternatives: "are very costly" or "are prohibitively priced."
Exact(59)
Tax amnesties are extremely expensive.
Rear tires in particular are extremely expensive!
Top-ranked research institutions are extremely expensive.
Mr. Isley said: "Older instruments are extremely expensive.
"Those systems are extremely expensive to install," Mr. Castelhano said.
Textbooks are extremely expensive, and expected to last 10 years.
Secondly, active RFID tags are extremely expensive and can cost up to $20 per tag.
Relatively modest houses are situated on pieces of land that are extremely expensive.
However, clinical-grade proteins for therapeutic use require sophisticated technologies and are extremely expensive to produce.
Methods for discrete design such as genetic algorithms are extremely expensive in computational cost.
Similar(1)
However, these scientific advances must be translated and the translational efforts are extremely expensive.
More suggestions(16)
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are exceptionally expensive
are tremendously expensive
are extremely valuable
are immensely expensive
are terribly expensive
are extremely burdensome
are prohibitively expensive
are extremely dear
are extremely overpriced
are extremely cost effective
are extremely high priced
are extremely cost
are extremely concerned
are extremely impressive
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com