Faultless, perfect (10)
I believe the answer is:
impeccable
I believe this is a double definition.
'faultless' is the first definition.
(I know that faultless can be written as impeccable)
'perfect' is the second definition.
(similar in meaning)
(Other definitions for impeccable that I've seen before include "Without fault" , "In accordance with the highest standards" , "Perfect - pure" , "Faultless" , "Immaculate" .)