Verified Answer :

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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.

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