ookii

Yes, as hanoun said, you'd use 大きい　（ookii) as the adjective, "big" 大好き is a na-adjective meaning "to like very much." The kanji 大 is pronounced, "dai," in this context. So, the whole would would be, "daisuki." "Dai," and "tai," are on-readings of that kanji. Normally, a kanji's on-reading isn't used when the kanji itself stands alone as a word. They are mostly used in compounds. There always are some exceptions, of course. Here are some examples: 書 図書館 to SHO kan, library 書く kaku, to write Sho--on-reading Ka(ku)--kun reading 人 三人--san nin (when used as a counter, the on-reading "nin" is used) 日本人-Ni hon jin (when used as a suffix for nationality, the on reading "jin" is used 人-Hito, when used alone, it is just pronounced with it's kun-yomi, "hito."

when u want to say 'big TV' u can use this adj ' 大きい = Ookii '