How to say "uninterrupted" in Japanese

• 円滑えんかつJLPT N1approx.Common
  na-adjectiveCovers 'uninterrupted' in the sense of activity proceeding smoothly, without hitches or friction — operations, communication, negotiations. The emphasis falls on smoothness and harmony rather than on continuity through time.
  彼かれは、中国語ちゅうごくごをしっていたので、私わたしたちは計画けいかくを円滑えんかつに実行じっこうできた。↗

  His knowledge of Chinese enabled us to carry out our plan smoothly.
• 連綿れんめん
  taru-adjective, adverb (with と)Describes something continuing unbroken over a long period, like a tradition or family line passed down without a break; the word for 'uninterrupted' meaning unbroken continuity, though a less common one.
• 常住不断じょうじゅうふだん
  no-adjectiveA four-character idiom meaning something goes on ceaselessly, without pause. Because it is a less common set phrase, it is seldom the word you want for plain 'uninterrupted'; it really stresses constant, unceasing continuation.
• 引きも切らないひきもきらない
  expression, i-adjectiveDescribes an incessant flow that never lets up, like a steady stream of visitors. Not a general adjective for uninterrupted time; it fits when 'uninterrupted' really means 'incessant.'
• 連々れんれん
  taru-adjective, adverb (with と), na-adjective (archaic)Expresses the same unbroken continuity as 連綿 — something going on and on without a break. It is a less common choice for this sense, and largely overlaps with 連綿 in meaning.

Choose 円滑 when the point is smooth, hitch-free progress; 連綿 or 連々 for something continuing unbroken over a long stretch; 「引きも切らない」 for an incessant, never-ending stream; 常住不断 only as a less common four-character idiom for ceaseless continuity.

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

• 円滑えんかつsmooth
• 連綿れんめんunbroken
• 常住不断じょうじゅうふだんceaseless
• 引きも切らないひきもきらないincessant
• 連々れんれんcontinuous