secret: implies concealment on any grounds for any motive: a ~ meeting.


covert: stresses the fact of not being open or declared: ~ operations against guerrilla forces.


stealthy: suggests taking pains to avoid being seen or heard especially in some misdoing: the ~ movements of a cat burglar.  (cat burglar飞贼: 身手敏捷,从上层楼窗或天窗入室行窃的贼)          misdoing坏事


furtive: implies a sly or cautious stealthiness: exchanged ~ smiles across the room.   sly和furtive互释，都表示设法隐藏(方法或目的)，不坦诚


clandestine: implies secrecy usually for an evil or illicit purpose: a ~ drug deal in a back alley.


surreptitious: applies to action or behavior done secretly often with skillful avoidance of detection and in violation of custom,law,or authority: compromised his diet with ~ snacking.      (snack: 零食点心)


underhanded: stresses fraudulent or deceptive intent: a car dealership guilty of ~ practices.


secret秘密: 出于任何理由任何目的的掩藏(concealment)，convert秘密: 强调未公开或宣布，stealthy: 竭力避免被发现(see,hear),常指坏事，furtive: 躲闪小心遮掩，clandestine: 常表示邪恶非法的目的，surreptitious: 偷偷的违反习俗法律权威(custom,law,authority)，underhanded: 强调诈骗欺瞒的目的。


记忆方法：1）首字母排序成SCS FCSU，FUCS福克斯号在南海South China Sea秘密航行

          2）练习一下

          3）秘密的意思是避免引人注意mean existing or done without attracting observation or attention.首字母排序成SCS FCSU，FUCS福克斯号在南海South China Sea秘密航行