An observer who is inconspicuous in the room is being unobtrusive. Inconspicuous is not easily seen or noticed. Let us define each terms to understand further through their dictionary definitions:
· Helpful is the willingness to help other people.
· Unobtrusive is when a person does not attract attention in a way that it bothers him.
· Obtrusive bothering people annoyingly.
· Quiet is the state of being calm.