(おお)

おおい
adjective (i-adjective)
many, much
1. many, much, numerous
Large in number or amount. The opposite of 少ない (すくない - few). Used for both countable and uncountable things.
There's a lot of homework.
This book has a lot of text.
There are many people today, aren't there?
There are many cars in this town, so the roads are always crowded.
There have been many rainy days recently, so the laundry won't dry.

(おお)い conjugates as an i-adjective: (おお)くない (negative), (おお)くて (te-form), (おお)かった (past). Important: (おお)い usually cannot directly modify nouns (× (おお)(ひと)). Instead, say (ひと)(おお)い or use たくさんの. However, (おお)くの (おおくの - many) can modify nouns: (おお)くの(ひと) (many people).