释义：微妙的，含蓄的，隐晦的，难以捉摸的，不明显的; 敏感的，敏锐的; 狡猾的; 巧妙的
Something that is subtle is not obvious: a professional food taster might be able to perceive subtle differences of flavor that most people don’t notice.
Subtle is used for things that are hard to describe because of their complexity or delicacy: a way of thinking, arguing, or creating a work of art. The word is pronounced like “suttle” and it was originally spelled that way when it was borrowed from Old French, but the b got imported to make the word look more like its ultimate source, the Latin adjective subtilis. If you try to pronounce the b, your ignorance of how to say the word properly won’t be very subtle!