膨大・厖大・尨大|ぼうだいboudai[0]heiban (flat)
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Which spelling to use
膨大膨大 is the most common written form, so it is the form learners are most likely to encounter in writing.
厖大厖大 is a kanji-only variant, but it is rarely used, so it is less likely to appear than 膨大.
尨大尨大 is a kanji-only variant, but it is rarely used, so it is less likely to appear than 膨大.
Definitions
- na-adjectivehuge; vast; enormous; colossal; extensive; large
- noun, suru verb, intransitive verbswelling; expansion
Conjugation
| Dictionary form | 膨大する（ぼうだいする） |
|---|---|
| Polite (masu) | 膨大します（ぼうだいします） |
| Negative (nai) | 膨大しない（ぼうだいしない） |
| polite (masen) | 膨大しません（ぼうだいしません） |
| classical zu / nu | 膨大せず・膨大せぬ（ぼうだいせず・ぼうだいせぬ） |
| Past (ta) | 膨大した（ぼうだいした） |
| polite (mashita) | 膨大しました（ぼうだいしました） |
| Past negative (nakatta) | 膨大しなかった（ぼうだいしなかった） |
| polite (masen deshita) | 膨大しませんでした（ぼうだいしませんでした） |
| Te form | 膨大して（ぼうだいして） |
| Potential | 膨大できる（ぼうだいできる） |
| Passive | 膨大される（ぼうだいされる） |
| Causative | 膨大させる（ぼうだいさせる） |
| Causative passive | 膨大させられる（ぼうだいさせられる） |
| Conditional (ba) | 膨大すれば（ぼうだいすれば） |
| tara | 膨大したら（ぼうだいしたら） |
| Volitional | 膨大しよう（ぼうだいしよう） |
| polite (mashou) | 膨大しましょう（ぼうだいしましょう） |
| Imperative | 膨大しろ（ぼうだいしろ） |
Common forms generated by rule; see the senses for honorific or irregular usage.
Synonyms & antonyms
- Synonym巨大きょだいNeutralNeutral word for sheer physical bulk, focusing on size and shape. 「膨大」 is about quantity or scale being astonishingly large, or swelling in size.
- Synonym甚大じんだいWrittenWritten word for severe damage or loss, as in 「甚大な被害」. 「膨大」 stresses quantity — how much there is.
- Synonym莫大ばくだいWrittenWritten word for huge sums or gains, as in 「莫大な費用」. 「膨大」 can describe costs too, but stresses sheer quantity and scale.
- Synonym増大ぞうだいWrittenWritten word for increase or growth, stressing the process of change. 「膨大」 describes the result as huge; 「膨大する」 also means to grow large.
- Synonym多量たりょうWrittenWritten word for a large quantity, as in 「多量の出血」. 「膨大」 stresses amounts so large they astound.
- Synonym多いおおいNeutralEveryday adjective for many or much. 「膨大」 emphasizes amounts so large they astound.
- Synonym大量たいりょうNeutralNeutral word for large quantities, as in 「大量生産」. 「膨大」 stresses sheer scale — amounts that astound.
- Synonym膨張ぼうちょうWrittenWritten word for expansion or swelling, of gas or the universe. 「膨大」 is about quantity or scale being enormous.
- SynonymおびただしいWrittenWritten word for numbers so vast they stagger, often with a negative tinge, as in 「夥しい血」.
- Synonym大きいおおきいNeutralEveryday adjective for big. 「膨大」 is about quantity or scale being enormous.
- Synonym極大きょくだいWrittenWritten word for a maximum value, mainly in math and physics. 「膨大」 describes quantities so large they astound.
- Synonym至大しだいWrittenRare written word for immensity. In most cases 「巨大」 is the natural choice instead.
- Related絶大ぜつだいWrittenWritten word for tremendous influence or effect, as in 「絶大な人気」. 「膨大」 is about sheer quantity, not influence.
- RelatedでかいCasualColloquial word for something big in size, casual in tone. 「膨大」 is more written and describes quantity.
- RelatedものすごいNeutralNeutral word for something astonishing in degree, for better or worse. 「膨大」 is about quantity or scale being enormous.
- Related凄まじいすさまじいNeutralNeutral word for violent, fearsome intensity. 「膨大」 is about quantity or scale, not force.
- RelatedおっきいCasualColloquial, childlike way to say big. 「膨大」 is more written and about quantity.
- Related膨らむふくらむNeutralVerb for puffing up or swelling — balloons, expectations. 「膨大」 describes quantity or scale as huge, and can also mean swelling.
- Related膨れ上がるふくれあがるNeutralVerb meaning to swell up or balloon, as a budget does. 「膨大」 is mostly an adjectival noun, though 「膨大する」 also works.
- Antonym微小びしょうWrittenWritten antonym: microscopic, the opposite of 「膨大」's vastness.
- Antonym狭小きょうしょうWrittenWritten antonym: narrow and cramped, the opposite of 「膨大」's hugeness.
Use 「膨大」 for amounts, data, costs or materials so vast they astound, or for things that have swollen in scale, as in 「膨大な資料」. For physical bulk choose 「巨大」; for money 「莫大」; for damage 「甚大」; for plain large amounts 「大量」 or 「多い」. 「絶大」 fits influence and effect, 「膨張」 and 「増大」 the process of expanding, and 「でかい」「大きい」 everyday talk about size. Antonyms: 「狭小」, 「微小」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
English equivalents
See also
