Mysterious= 詭秘,難以理解的,模糊的, 魔力、玄;He likes to be mysterious(他喜歡搞神秘)
mystical = 奧秘的,神奇,奧妙;human anatomy still remains mystical today(人類解剖學到今天,還是他的奧妙之處/很神奇)