全盛|ぜんせいzensei[0]heiban (flat)

1. no-adjectiveheight of prosperity
   その歌手かしゅはその歌うたのときが全盛ぜんせいでした。↗

   The singer was at his best in that song.

• Synonym最盛期さいせいきNeutralRefers to the period of greatest flourishing, also the peak season, as in 「最盛期のブドウ」; 「全盛」 stresses the state of peak power or popularity.
• Synonym黄金時代おうごんじだいNeutralThe period when a field was at its most flourishing, with a praising nuance; 「全盛」 is more concise and can also refer to a person's prime.
• Synonym最高潮さいこうちょうNeutralThe climax of a story or atmosphere; 「全盛」 is about a period of peak power.
• Synonym真っ盛りまっさかりNeutralRight in the very height of something, emphatic and colloquial; 「全盛」 is more written/formal.
• Synonym盛時せいじWrittenWritten/formal prose for a time of prosperity, and rarely used; 「全盛」 is the usual word.
• Synonym全盛期ぜんせいきNeutralRefers to the heyday, stressing that period of time; 「全盛」 stresses the state of being at the height itself.
• Related花はなNeutralA flower, or one's finest moment, as in 「若いうちが花」; 「全盛」 stresses being at the height of power.
• Related頂点ちょうてんNeutralThe top or highest point, not tied to any particular period; 「全盛」 is about flourishing over a stretch of time.
• Related盛りさかりNeutralThe height of something, as in 「暑い盛り」「花の盛り」; colloquial, whereas 「全盛」 is written/formal prose.
• Related絶頂ぜっちょうNeutralThe summit or extreme point, as in 「人気の絶頂」, stressing that the highest point has been reached; 「全盛」 stresses the state of peak power.
• Related花盛りはなざかりNeutralFlowers in full bloom, or being at the peak of beauty and popularity; 「全盛」 stresses the height of power.
• RelatedピークNeutralA loanword for peak, often used of figures and data; 「全盛」 is about power and popularity.
• RelatedたけなわWrittenWritten/formal prose for a party or season in full swing, as in 「宴たけなわ」; 「全盛」 stresses peak power.
• Antonym衰退すいたいNeutralDecline or weakening — the opposite of 「全盛」 at its height.
• Antonym没落ぼつらくNeutralDownfall and ruin — the opposite of 「全盛」 at its height.
• Antonym斜陽しゃようWrittenWritten/formal prose for decline like a setting sun, as in 「斜陽産業」; the opposite of 「全盛」.

Use 「全盛」 for being at the height of power or popularity, as in 「全盛期」「全盛を誇る」. For the most flourishing season say 「最盛期」; for a golden age, 「黄金時代」; for the top or peak, 「頂点」 or 「ピーク」; for decline, 「没落」 or 「衰退」.

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

1. 最もっとも勢いきおいの盛さかんな状態じょうたいにあること。