高価|こうかkouka[1]atamadaka (head-high)

1. na-adjective, nounhighly priced; expensive; valuable; costly
   そんな高価こうかな本ほんは買かえないよ。↗

   I can't buy a book this expensive.

• Synonym高いたかいNeutralThe everyday default; also covers height and level, not just price. 「高価」 is more formal and written, only about price, but works for goods and services alike.
• Synonym高額こうがくNeutralRefers to large sums of money, amounts themselves as in 「高額所得」; 「高価」 describes goods or services whose price is high.
• Related割高わりだかNeutralMeans comparatively expensive for the quality or quantity you get, as in 「割高な料金」; 「高価」 simply states that the price is high.
• Related上等じょうとうNeutralRefers to superior quality or a high grade; 「高価」 is only about price.
• Related高級こうきゅうNeutralIndicates high class or a high-end grade, as in 「高級ホテル」; 「高価」 focuses on the price being high.
• Antonym安価あんかNeutralThe price antonym of 「高価」, meaning cheap or low-priced; it can also figuratively suggest something cheap or shallow.
• Antonym廉価れんかNeutralAlso the price antonym of 「高価」, meaning low-priced; often seen in 「廉価版」 (budget edition).

For everyday 'expensive', say 「高い」; pick 「高価」 for a more formal, written tone about price. Use 「高額」 for large sums of money, 「高級」 for high-end quality, and 「割高」 when something is pricey for what it offers. Antonyms: 「安価」, 「廉価」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 値段ねだんの高たかい様子ようす。