Crossword Genius

Member of a group of Greek philosophers who held that real knowledge is not possible (7)

Ross

I believe the answer is:

sceptic

(Other definitions for sceptic that I've seen before include "I may doubt that" , "Greek philosopher" , "Agnostic" , "Person who doubts the truth" , "Disbeliever" .)

I've seen this clue in The Times.
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