Promise with total certainty (9)
I believe the answer is:
guarantee
(Other definitions for guarantee that I've seen before include "Something ensuring a particular outcome" , "Promising" , "Formal assurance" , "Undertake" , "security system" .)
I believe the answer is:
guarantee
(Other definitions for guarantee that I've seen before include "Something ensuring a particular outcome" , "Promising" , "Formal assurance" , "Undertake" , "security system" .)