unrecognisable

From un- +‎ recognisable.

unrecognisable (comparative more unrecognisable, superlative most unrecognisable)

1. Alternative spelling of unrecognizable
   • 1952 January, Henry Maxwell, “Farewell to the "T14s"”, in Railway Magazine, page 57:

     To nostalgic eyes they became absolutely and almost mercifully unrecognisable. Nor did they escape a full measure of denigration.

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

     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.

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

     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.