That would depend on your own moral and ethical grounds. Personally i would say no.
Michelle was eavesdropping on Bob and Richard's conversation.
I was eavesdropping on my sister's conversation.
An unethical act is an action that is considering unethical or immoral by the general public or a court.eg. Kicking a puppy in the face.
immoral, unethical
unethical is more an immoral issue than an illegal issue
I eaves droped your mom last night. (: Thats what she said xD
Unethical competition is trying to beat the competition by using immoral means. An example is employing slave labor in order to cut production costs.
"Mud Slinging."
Behavior in childhood can sometimes be indicative of radical or sociopathic behavior in adulthood, and these behavior patterns often result in unethical or immoral acts. This kind of behavioral prediction is not foolproof, and people can often resist such behavioral patterns.
mud-slinging
Criminal acts refer to a violation of the rights of other men by the use of force. By society's standards, most crimes are immoral.
It means that someone thought you were asking a question that was too personal, or that you were eavesdropping on a private conversation.