left on delivered
tense
the one-line answer
A message was delivered to someone's phone but they have not opened it.
Left on delivered is the slightly less severe version of left on read. Your message reached their phone but they have not opened it yet. Or they are ignoring the notification.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
frustrated
left on delivered for an hour. he's definitely avoiding it.
My message reached his phone but he is not opening it.