広大・宏大・弘大|こうだいkoudai[0]heiban (flat)
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Which spelling to use
広大広大 is the most common written form of this word and the recommended choice for learners when writing it.
宏大宏大 is a rarely used kanji-only variant of 広大, so it appears less often in writing and is not the first choice for learners.
弘大弘大 is a rarely used kanji-only variant of 広大, so it appears less often in writing and is not the first choice for learners.
Definitions
- na-adjective, nounvast; extensive; immense; huge; large; grand; magnificent
Conjugation
| Plain form | 広大（こうだい） |
|---|---|
| Polite (desu) | 広大です（こうだいです） |
| Negative (dewa nai) | 広大ではない（こうだいではない） |
| polite (dewa arimasen) | 広大ではありません（こうだいではありません） |
| Past (datta) | 広大だった（こうだいだった） |
| Past negative (dewa nakatta) | 広大ではなかった（こうだいではなかった） |
| Te form (de) | 広大で（こうだいで） |
| Adverbial (ni) | 広大に（こうだいに） |
| Conditional (nara) | 広大なら（こうだいなら） |
Common forms generated by rule; see the senses for honorific or irregular usage.
Synonyms & antonyms
- Synonym広いひろいNeutralThe everyday adjective for anything wide or large in area, and the most broadly usable; 「広大」 is more written and stresses a boundless expanse and grand scale.
- Synonym広範こうはんWrittenWritten style for wide-ranging influence, knowledge, and the like, as in 「広範な知識」; 「広大」 is for vast physical space.
- Synonym幅広いはばひろいNeutralCovers physical width and, more often, a broad range of activity or knowledge, as in 「幅広い知識」; 「広大」 leans toward vast space.
- Synonym広範囲こうはんいNeutralRefers to how far something extends or covers, as in 「広範囲にわたる被害」; 「広大」 describes the vastness of land, sea, or outer space.
- Synonym広闊こうかつWrittenWritten word for open, sweeping vistas and landscapes; rarer than 「広大」, and in daily speech 「広大」 or 「広い」 is the normal choice.
- Synonym広々としたひろびろとしたNeutralDepicts open, unobstructed space with a feeling of roominess, as in 「広々とした部屋」; 「広大」 is more written and implies a much larger scale.
- Synonym浩瀚こうかんWrittenA literary term reserved for books that run to many volumes or pages; it never describes space, unlike 「広大」 for vast land or sea.
- Related大規模だいきぼWrittenWritten style for the large scale of construction projects, events, or organizations, as in 「大規模な工事」; 「広大」 is about physical expanse.
- Antonym微小びしょうWrittenWritten antonym meaning extremely small, applied mostly to particles, quantities, and changes; opposite of 「広大」 in size.
- Antonym狭小きょうしょうWrittenWritten antonym for cramped, confined sites or housing, as in 「狭小住宅」; it stands at the opposite pole from 「広大」 in area.
Use 「広大」 for vast stretches of space such as land or ocean, as in 「広大な土地」. For ordinary width or roominess choose 「広い」; for broad scope 「広範」 or 「幅広い」; for large-scale projects 「大規模」. The opposite in area is 「狭小」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
English equivalents
