好景気|こうけいきkoukeiki[3]nakadaka (mid-high)

1. noungood times; boom; (wave of) prosperity
   市しの産業さんぎょうはみんな好景気こうけいきに沸わいている。↗

   All the industries in the city are booming.

• Synonym好況こうきょうNeutralSame meaning as 「好景気」 but more written in flavour; typical of economic news reports rather than everyday talk.
• SynonymブームNeutralLoanword. It can mean an economic boom, but in modern usage it usually refers to a temporary craze or fad for something.
• Antonym不景気ふけいきNeutralThe antonym: an economic slump or hard times. The everyday word, directly opposite to 「好景気」.
• Antonym不況ふきょうNeutralAntonym meaning recession or depression. Common in written prose and news reports, pairing with 「好況」.

Use 「好景気」 for good economic times in everyday speech. 「好況」 says the same thing in written, news-report style. 「ブーム」 today usually means a passing craze. For the opposite, 「不景気」 is the everyday word and 「不況」 the written one.

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

1. 経済けいざいが順調じゅんちょうで、景気けいきが良よい状態じょうたい。