Definition of "unimpressed"

It says the station's four ticket office windows were closed, with passengers directed to the five ticket machines, which "resulted in chaos". The TSSA reported: "Within four minutes the queues were unmanageable, and the ticket office was forced to reopen for customers, who were said to be unimpressed."

2023 November 1, “Network News: TSSA: Benfleet ticket office 'stress test' was a failure”, in RAIL, number 995, page 9