"___ is fatal only to the mediocre” (Albert Camus) (8)

I believe the answer is:

idleness

(Other definitions for idleness that I've seen before include "Reluctance to work" , "not working" , "Inertia" , "Sloth - there may be love in it" , "State of inactivity" .)

I've seen this clue in The Independent.

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