大きな|おおきなookina[1]atamadaka (head-high)

1. pre-noun adjectivalbig; large; great
   アメリカ人あめりかじんの中なかには大おおきな借金しゃっきんを抱かかえている人ひとがいる。↗

   Some Americans have grave debts.

• Synonym大きいおおきいNeutralAn i-adjective that works both as a predicate and before nouns, as in 「この家は大きい」; 「大きな」 can only modify nouns.
• Related大幅おおはばNeutralDescribes a large margin or extent — 「大幅な値上げ」, 「大幅なリード」 — used with changes and gaps; also means full-width cloth. Not for an object's physical size.
• Related重大じゅうだいNeutralMeans serious or grave, as in 「重大な問題」; it stresses weight and importance rather than physical size.
• Related著しいいちじるしいWrittenDescribes marked changes or differences, as in 「著しい成長」; belongs to written/formal prose rather than everyday speech.
• Related大したたいしたNeutralAlso a pre-noun word; means considerable or remarkable, and often appears in the negative 「大したことない」.
• Antonym小さなちいさなNeutralThe direct opposite of 「大きな」, meaning small; like 「大きな」, it can only come before a noun.

To say something is big, use 「大きな」 before a noun or 「大きい」, which also works as a predicate. For large changes or margins use 「大幅」, for serious or important matters 「重大」, and for striking changes 「著しい」.

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

1. サイズや範囲はんいが広ひろく、数量すうりょうが多おおいさま。