白昼|はくちゅうhakuchuu[0]heiban (flat)

1. noun, adverbdaytime; midday
   ３人組にんぐみが白昼はくちゅうその銀行ぎんこうを襲おそった。↗

   A gang of three robbed the bank in broad daylight.

• Synonym昼ひるNeutralCovers noon, daytime and even lunch; the most versatile of these words, and not tied to formal prose the way 白昼 is.
• Synonym日中にっちゅうNeutralDaytime, as in 「日中の気温」 or 「日中は留守です」; a touch more formal than 「昼間」 but not as bookish as 白昼.
• Synonym昼間ひるまNeutralThe everyday default for the hours of daylight, set against night; a general word fine in speech and writing alike, without the bookish tone of 白昼.
• Synonym昼日中ひるひなかNeutralEmphatic 'broad daylight', as in 「昼日中から酒を飲む」; colloquial, where 白昼 is at home in written prose.
• Synonym昼中ひるなかNeutralAlso just 'daytime'; colloquial and not often heard, whereas 白昼 has a literary ring.
• Antonym真夜中まよなかNeutralAntonym: the dead of night, the very opposite of 白昼 in the sense of broad daylight.
• Antonym深夜しんやNeutralAntonym: late at night, standing against 白昼 as the daytime term.

Use 「昼間」 for everyday talk about daytime; 「日中」 is slightly more formal, 「昼」 the most versatile (also lunch). 「昼日中」 stresses broad daylight, 「昼中」 is colloquial and rare. Keep 「白昼」 for written prose like 「白昼堂々」 or 「白昼の犯行」. Antonyms: 「真夜中」, 「深夜」.

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

1. 真昼まひる。日中にっちゅう。