silence
definition:
the state of being forgotten
or
absence or omisson of mention, comment, or expressed concern
being forgotten, silence is identic to an isolated place or where there is almost nobody. thus, no one will talk neither comment.
nevertheless, the essence of the comment and concern are 2-way communication. forgetting involves 2 parties - at least.
indeed, silence covers broader things. it could be a silence even though a counterpart is talking directly to you.
silence could be in the middle of the most crowded place it could be. it is not the words, but the respect and trust decide the most.