延々・延延・蜿蜒・蜿蜿|えんえんen'en[0]heiban (flat)

1. adverb (with と), taru-adjectiveendlessly; continuously; (going) on and on
   彼かれのスピーチは延々えんえんと続つづいた。↗

   His speech went on and on.
2. taru-adjective, adverb (with と)meandering; winding; sinuous; serpentine
   アマゾン川かわは延々えんえんと北きたブラジルを流ながれている。↗

   The Amazon River meanders through northern Brazil.

• SynonymずっとNeutralThe most common word for the whole time; also far or much in comparisons. Colloquial; 「延々」 stresses something drawn out and tedious.
• Synonym絶えずたえずNeutralConstantly, as in 「絶えず努力する」; stresses never stopping.
• Synonym絶え間なくたえまなくNeutralWithout a single pause; stresses no gaps in between. Leans written.
• Synonym長々ながながNeutralAt great length, as in 「長々と話す」; carries a long-winded nuance close to 「延々」.
• SynonymとめどなくNeutralUnstoppably, as in 「涙が止めどなく流れる」; mostly for tears and emotions.
• Related続々ぞくぞくNeutralOne after another, as in 「続々と到着する」; stresses people or things arriving in succession rather than one thing dragging on.
• Related持続的じぞくてきNeutralSustained or continuous, as in 「持続的な成長」; objective description with no tinge of tedium.
• RelatedいつまでもNeutralForever, indefinitely, often with feeling, as in 「いつまでも待つ」; stresses there being no end point.
• Related末永くすえながくNeutralFor many years to come, mostly in well-wishes like 「末永くよろしく」; carries a warm, positive feel.
• Related永々えいえいWrittenForever or for a very long time; very literary. 「延々」 stresses a process dragging on and on.
• Related縷々るるWrittenUnbroken in a long, thin thread; also giving an account in full detail, as in 「縷々説明する」. Written style.
• Relatedぶっ続けぶっつづけCasualColloquial: doing something continuously without a break, as in 「三日ぶっ続けで」. 「延々」 adds a sense of something long-winded and tiresome.
• RelatedのべつまくなしCasualColloquial idiom for talking or doing something nonstop, usually with a note of irritation.
• Related幾久しくいくひさしくWrittenWritten and solemn; used in blessings, as in 「幾久しくお幸せに」.
• Related際限なくさいげんなくNeutralWithout limit or end; stresses boundlessness, going on with no stopping point.
• Related尽未来際じんみらいさいWrittenBuddhist term meaning until the end of time; extremely literary and not used in daily life.
• Related間断なくかんだんなくWrittenWritten word for continuing without interruption; stresses no gaps along the way.
• RelatedのべつCasualColloquial, usually in 「のべつ幕なし」; nonstop action with an undertone of annoyance.
• Related引きも切らずひきもきらずNeutralUsed for a steady stream of visitors, phone calls and the like; stresses one coming after another.
• Related千代に八千代にちよにやちよにFormalFormal blessing for endless generations, as in the national anthem; extremely solemn.
• Related連続的れんぞくてきNeutralContinuous or successive, as in 「連続的な変化」; objective, rather academic description.

Use 「延々」 for something that drags on and on, often with a tinge of tedium, as in 「延々と続く会議」. For simply the whole time choose 「ずっと」; for well-wishes about lasting long, 「末永く」. For people or things arriving one after another use 「続々」; for doing something without a break, 「ぶっ続け」; for no gaps at all, 「絶え間なく」 or 「間断なく」; for tears and feelings, 「止めどなく」.

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

1. ずっと長ながく続つづくこと。また、そのようなさま。