unobserved

un|ob|served /'ʌnəbz'ɜːrvd/
[ADJ] v-link ADJ, ADJ after v, ADJ n
If you do something unobserved, you do it without being seen by other people.
Looking round to make sure he was unobserved, he slipped through the door...
John had been sitting, unobserved, in the darkness.
= unseen

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