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) 秘密的意思是做事避免引人注意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