豪華|ごうかgouka[1]atamadaka (head-high)

1. na-adjective, nounextravagant; lavish; opulent; luxurious; magnificent; splendid; fancy; gorgeous
   何なんと豪華ごうかな家々いえいえでしょう。↗

   What splendid houses they are!

• Synonym豪勢ごうせいNeutralLavish scale and display, as in 「豪勢な料理」, often said with a tone of amazement; more colloquial than 「豪華」.
• SynonymデラックスNeutralA loanword for deluxe versions and premium models, mostly in product and hotel-room names; in everyday speech say 「豪華」.
• Synonym贅沢ぜいたくNeutralLuxury and indulgence: stresses spending beyond what is necessary and can carry a critical nuance; 「豪華」 stresses the gorgeous look itself.
• Synonym華麗かれいNeutralGorgeous elegance, typically for performances and technique, as in 「華麗な演技」; 「豪華」 is mostly said of things.
• Synonym立派りっぱNeutralFine, imposing and splendid, and also used to praise a person's character; its range is far wider than that of 「豪華」.
• Synonym豪奢ごうしゃWrittenWritten/formal prose for extreme luxury and extravagance, with a whiff of wasteful excess; 「豪華」 focuses on the outwardly gorgeous, high-class look.
• Synonym奢侈しゃしWrittenWritten/formal prose for luxury and waste, with a critical colouring, as in 「奢侈品」; 「豪華」 is mostly positive.
• Related壮麗そうれいWrittenWritten/formal prose for magnificent buildings and scenery; stresses scale and imposing grandeur, while 「豪華」 stresses decoration and fine materials.
• RelatedきらびやかNeutralGlittering and dazzling, stressing the shining visual effect; 「豪華」 stresses high grade and cost.
• Related華やかはなやかNeutralBright, colorful and eye-catching; also used for people who look radiant. 「豪華」 stresses how much is spent and how high-class it is.
• Related華々しいはなばなしいNeutralBrilliant and conspicuous, as in 「華々しいデビュー」; mostly describes deeds and achievements rather than things.
• Related豪壮ごうそうWrittenWritten/formal prose for grand, imposing scale — buildings, mansions, or boldness of spirit; 「豪華」 stresses rich decoration and heavy spending.
• Antonym質素しっそNeutralAntonym: simple and frugal, the opposite of the luxurious 「豪華」.
• Antonym簡素かんそNeutralAntonym: plain and unadorned, the opposite of the richly decorated 「豪華」.

Use 「豪華」 for rich materials and sumptuous splendor. For lavish display say 「豪勢」, for spending beyond necessity 「贅沢」, for gorgeous technique 「華麗」, for grand scale 「壮麗」, and for simplicity 「質素」. Each of the other words has its own focus, explained in its note.

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

1. はなやかで、いかにもお金かねがかかっている様子ようす。極きわめてはでやかなこと。