So changed or altered that it's impossible to know what something or someone is.
Prefix 'un-' (not) plus 'recognizable' from Latin 'recognoscere' (to know again). Means unable to be known again due to changes.
Witness identification becomes unrecognizable to the brain in just 48 hours—people's memories of faces degrade so fast that courts now distrust eyewitness testimony from that long ago.
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