This な-adjective means "important" or "precious." It describes something that has great value, significance, or is cherished. Usage: Connect with な to a noun (e.g., 大切な友達). Or, (thing) は 大切です. Example: This book is very important to me.

「重要」「貴重」という意味。価値があり、重んじるべきものや人を表す。「な」をつけて名詞を修飾。例：この本は私にとってとても大切です。