Greatest possible amount (6)
I believe the answer is:
utmost
(Other definitions for utmost that I've seen before include "Farthest" , "Finest" , "'Most extreme, greatest (6)'" , "Level best" , "Maximum effort" .)
I believe the answer is:
utmost
(Other definitions for utmost that I've seen before include "Farthest" , "Finest" , "'Most extreme, greatest (6)'" , "Level best" , "Maximum effort" .)