How to say "huge" in Japanese

Choosing the right word
  • でかいJLPT N1approx.Common
    i-adjectiveThe casual spoken word for something physically big or enormous; it suits relaxed conversation about objects, people, or animals, and sounds out of place in formal writing.
    こんなデカイのがチャリの荷台にだいに乗のるわけないだろ。↗
    There's no way one that big is going to go on a bike's luggage rest.
  • 巨大きょだいJLPT N3approx.Common
    na-adjective, nounDescribes gigantic physical size — enormous buildings, structures, or creatures. Use it when 'huge' refers to the sheer magnitude of a thing rather than an amount.
    The huge tanker has just left the dock.
  • 膨大ぼうだいJLPT N2approx.Common
    na-adjectiveCovers 'huge' for quantities and volumes: vast amounts of data, work, time, or money. It is about sheer bulk of amount, not the size of a physical object.
    インテル社しゃはその発明はつめいで膨大ぼうだいな特許料とっきょりょうを得えている。↗
    Intel gets a huge royalty from the invention.
  • 莫大ばくだいJLPT N3approx.Common
    na-adjectiveMatches 'huge' for immense amounts, especially sums of money — vast costs, losses, or debts. It fits amounts of value rather than the size of physical things.
    ジョンは莫大ばくだいな財産ざいさんを相続そうぞくした。↗
    John inherited a large fortune.
  • 多大ただいCommon
    na-adjective, no-adjectiveReally means 'great in quantity or amount' — a great deal of effort, influence, or damage — not 'huge' in size. For physical hugeness it is the wrong word; think 'a great deal of'.
    The typhoon has done much harm.

Use 「でかい」 casually for big things, 巨大 for gigantic physical size, 膨大 for vast quantities, 莫大 for immense amounts such as money, and 多大 for great amounts or degrees of abstract things rather than size.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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