Hidden facts, feelings, activities, or problems are not easy to notice or discover. 隐藏的 Under all the innocent fun, there are hidden dangers, especially for children.
verb [vt. 及物动词]隐藏;躲避;遮挡(hide 的过去分词)
She kept her feelings hidden fathoms deep. 她把感情深深地隐藏在心中。