最大|さいだいsaidai[0]heiban (flat)

1. no-adjectivebiggest; greatest; largest; maximum
   彼かれの最大さいだいの欠点けってんはしゃべりすぎることだ。↗

   His greatest fault is talking too much.

• Synonym最高さいこうNeutralA noun for what is highest or best (「最高の気分」), centering on quality; 最大 centers on the largest scale or quantity.
• Synonym最大限さいだいげんNeutralA noun for the maximum limit (「最大限努力する」), stressing doing something to the very limit.
• SynonymマキシマムNeutralA loanword meaning maximum or maximum limit, used in technical, advertising, and entertainment fields; the Sino-Japanese 最大 is more general.
• Synonym最大値さいだいちNeutralA noun for the maximum value, a term of mathematics and statistics.
• Synonym最大限度さいだいげんどNeutralA noun for the maximum limit, more formal and solemn, often used in official documents.
• Synonym極大きょくだいWrittenA written word for something extremely large; in math it also means a local maximum (「極大値」), while 最大 is the largest within a comparison.
• Antonym最小さいしょうNeutralMeans smallest or least (「最小限」), the direct opposite of 最大.

Use 「最大」 for the largest scale, quantity, or degree (「世界最大」「最大の原因」). For best quality say 「最高」, for doing your utmost 「最大限」, for math 「最大値」; the opposite is 「最小」.

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

1. 最もっとも規模きぼが大おおきいこと。
2. 最もっとも多おおいこと。
3. 最もっとも程度ていどがはなはだしいこと。
4. 最もっとも規模きぼが大おおきいもので、場合ばあいで。
5. 最もっとも多おおい場合ばあいで。