(おお)きい

おおきい
adjective (i-adjective)
big, large
1. big, large (in size)
Describes physical size. Used for objects, spaces, animals, and anything that can be measured by size. The opposite is (ちい)さい (chiisai, small).
(おお)きい(いぬ)
It's a big dog.
この(いえ)(おお)きいです
This house is big.
もっと(おお)きいあります
Do you have a bigger one?
This room was bigger than I thought.
His dreams are big—he says he wants to travel around the world someday.
2. loud (of sound/voice)
When describing voices or sounds, (おお)きい means loud. (おお)きい(こえ) (ookii koe) means a loud voice.
(こえ)(おお)きい。
Your voice is loud.
もっと(おお)きい(こえ)
Louder, please.
テレビ(おと)(おお)きすぎる。
The TV is too loud.
(おお)きい(おと)()きた
I woke up to a loud noise.
I couldn't sleep because of the loud sounds coming from the next room.

(おお)きい is an i-adjective. Before nouns, it can be used as (おお)きい or (おお)きな (ookina). (おお)きな is a special attributive form that can only be used directly before nouns ((おお)きな(いえ)), while (おお)きい can be used both attributively and predicatively. Conjugation: (おお)きくない (negative), (おお)きかった (past).