Definition of "unrecognisable"

The station has been refurbished both at ground level and below ground, where the wide, fluorescently lit platforms are an almost unrecognisable metamorphosis of the dingy, reeking Low Level of old.

1960 December, “The Glasgow Suburban Electrification is opened”, in Trains Illustrated, page 713

Standing on the platforms at Derby today, the station is virtually unrecognisable from how it was during the mid-to-late 2000s, when it seemed as if it was in terminal decline.

2019 December 4, Andy Coward, “Derby's crowning achievement”, in Rail, page 57