How to say "lengthy" in Japanese

• 大部たいぶJLPT N1approx.Common
  no-adjectiveCovers 'lengthy' of books and similar works: voluminous, a thick, many-paged tome. It describes bulk, not tedium — use it neutrally, as of a long novel. A common word.
• 長尺ちょうじゃく
  no-adjectiveMeans 'long', especially of photographic film; as 'lengthy' it is a less common, neutral option, suggesting extent or duration without any critical overtone.
• 長たらしいながたらしい
  i-adjective'Lengthy' with disapproval: overlong and tedious, dragging on past all patience. Fits speech or writing that simply goes on too long. A less common word.
  講演こうえんは長ながたらしくて私はつまらなくなった。↗

  The lengthy lecture palled on me.
• くだくだしい
  i-adjective'Lengthy' through wordiness: tedious and long-winded, using far more words than the matter calls for. Typical of explanations or prose that pile up unnecessary words. A less common word.
• 冗長じょうちょう
  na-adjective, noun'Lengthy' as verbosity: verbose, wordy, tedious. A critical word for writing or speech that uses far too many words, emphasizing the excess rather than mere length. A less common word.

Use 大部 for a voluminous book, 長尺 for what is simply long (especially photographic film), and 「長たらしい」, 「くだくだしい」, or 冗長 when 'lengthy' implies tedious, wordy excess.

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

• 大部たいぶlengthy (of a book, etc.)
• 長尺ちょうじゃくlong (esp. of photographic film)
• 長たらしいながたらしいtedious
• くだくだしいtedious
• 冗長じょうちょうtedious