不断|ふだんfudan[0]heiban (flat)

1. no-adjective, na-adjectiveconstant; persistent; unremitting; ceaseless
   小脳しょうのうは血液けつえきの不断ふだんの供給きょうきゅうを必要ひつようとする。↗

   The brain needs a continuous supply of blood.
2. noun, na-adjectiveindecisiveness
3. no-adjective, adverbusual; normal; everyday; habitual; ordinarynow written as 普段

• Related優柔不断ゆうじゅうふだんNeutralFour-character idiom for indecisiveness; the most common everyday choice, since 「不断」 alone rarely expresses this sense now.
• Related躊躇ちゅうちょNeutralHesitation or wavering; common in written prose, as in 「躊躇なく」 (without hesitation).
• Related因循いんじゅんWrittenWritten word for clinging to old conventions and letting things drag on, as in 「因循姑息」; the emphasis is on conservatism.
• Related不決断ふけつだんWrittenWritten word for being unable to make up one's mind; used rather rarely.
• Related優柔ゆうじゅうWrittenWritten word for being weak and unable to decide; mostly seen inside 「優柔不断」 rather than alone.
• RelatedためらいNeutralNative Japanese noun for hesitation or holding back, as in 「躊躇いがある」; stresses momentary wavering.
• Related逡巡しゅんじゅんWrittenWritten word for hesitating and failing to move forward; the stress is on holding back in one's actions.
• Related遅疑逡巡ちぎしゅんじゅんWrittenFour-character idiom for wavering and hesitation; written style, stressing procrastination.

「不断」 for lack of decisiveness is now used almost only in 「優柔不断」; its other sense, constant and unceasing, lives on in phrases like 「不断の努力」. For a moment's hesitation say 「躊躇」 or 「躊躇い」; for holding back and not advancing, 「逡巡」.

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

1. 絶たえずに続つづいていること。
2. 決断力けつだんりょくがないこと。
3. 普通ふつうの状態じょうたいであること。普段ふだん。