日曜日
にちようび
nichiyoubi
= Sunday
日曜日 (nichiyoubi) is the Japanese word for Sunday, and its structure reveals a fascinating parallel with English: 日 means “sun” or “day,” 曜 indicates a day of the week, and together they form “the sun’s day” — the same solar origin that gave English its “Sunday.”
日曜日 refers specifically to Sunday, the seventh and final day of the week in the Japanese calendar (though displayed last on Japanese calendars, which run Monday–Sunday). In Japan, Sunday functions as the primary rest day for most workers and students. The word is used in everyday speech with no formal or casual variation — nichiyoubi is appropriate in any context, from family conversation to business scheduling. It is commonly shortened to nichiyou (日曜) in casual speech and in compound words, dropping the final 日 without any change in meaning.
Japanese days of the week follow a consistent pattern: [celestial body or element] + 曜日. Once you learn this pattern, all seven days are predictable. The short form 日曜 drops the trailing 日 and is especially common in compound nouns like nichiyou daiku (日曜大工, DIY home repair) and nichiyou gaka (日曜画家, Sunday painter — an amateur artist). On Japanese calendars and apps, Sunday is typically printed in red to mark it as a holiday, while Saturday appears in blue; this color coding is deeply ingrained in visual culture. Do not confuse 日曜日 with 今日 (kyou, today) or 毎日 (mainichi, every day) — all use 日 but with entirely different meanings.
日曜日 is built from two kanji: 日 (nichi / hi / bi), which means “sun” or “day,” and 曜 (you), which designates a day of the week. The character 曜 combines the radical 日 (sun) with 翟, a stylized bird associated with brilliance — reinforcing the luminous quality of each named day. Every Japanese day of the week uses this same 曜 structure: 月曜日 (Monday, moon’s day), 火曜日 (Tuesday, fire’s day), 水曜日 (Wednesday, water’s day), 木曜日 (Thursday, wood’s day), 金曜日 (Friday, gold/metal’s day), and 土曜日 (Saturday, earth’s day). 日曜日 completes the set with the sun.
Everyday use
日曜日に家族でピクニックに行く予定です。
Nichiyoubi ni kazoku de pikunikku ni iku yotei desu.
We’re planning to go on a picnic with the family on Sunday.
Casual / Social Media
日曜日の朝はコーヒー片手にのんびり過ごすのが最高☀️
Nichiyoubi no asa wa koohii katate ni nonbiri sugosu no ga saikou ☀️
There’s nothing better than a lazy Sunday morning with a cup of coffee in hand ☀️
Formal / Cultural context
次回の会議は日曜日を除く平日に設定してください。
Jikai no kaigi wa nichiyoubi wo nozoku heijitsu ni settei shite kudasai.
Please schedule the next meeting on a weekday, excluding Sunday.
In Japan, Sunday carries a distinct cultural weight as the de facto family day. The phrase kazoku saabisu (家族サービス) — literally “family service” — describes the expectation that working adults, particularly fathers, dedicate Sunday to outings, errands, or leisure with their families rather than work. Shopping malls, theme parks, and restaurants peak on Sundays, and temple and shrine visits (including the New Year’s hatsumoude) are clustered on Sundays throughout the year. This collective rhythm makes 日曜日 feel culturally heavier than a simple calendar entry.
The word 日曜 has also become a productive prefix that signals “amateur hobby” or “leisure activity.” 日曜大工 (nichiyou daiku, literally “Sunday carpenter”) describes DIY home improvement done by non-professionals on their day off — a concept so established it appears in dictionaries and hardware store marketing. Similarly, 日曜画家 (nichiyou gaka, “Sunday painter”) refers to someone who paints as a personal passion rather than a profession. These compounds reflect how postwar Japan came to associate Sunday not just with rest, but with self-improvement and creative pursuits outside one’s main career.