What you call somebody who is involved in activities that they would prefer nobody to know about because they make sure that their activities go unnoticed. These people also do not like surprise visits in case they are involved in schnaily activities.

Micro marriging is when your partner manages your personal day-to-day tasks with you much like a Micro Manager at work.

Sneaky, sly, secretive, a person who looks like butter wouldn't melt in his/her mouth, somebody who is constantly up to no good but never gets caught.