Very sure, certain (8)
I believe the answer is:
positive
(Other definitions for positive that I've seen before include "Sure, convinced" , "Very sure, certain" , "Confident, very sure" , "Optimistic; certain" , "Definite, sure" .)
I believe the answer is:
positive
(Other definitions for positive that I've seen before include "Sure, convinced" , "Very sure, certain" , "Confident, very sure" , "Optimistic; certain" , "Definite, sure" .)