The quality of being full of forethought; the characteristic of thinking carefully about future consequences.
From forethoughtful + -ness. This noun suffix converts an adjective into an abstract noun expressing the quality being described.
Psychologists would call forethoughtfulness 'executive function'—it's literally what lets humans plan societies, build infrastructure, and save for retirement instead of just living moment-to-moment.
Complete word intelligence in one call. Free tier — 50 lookups/day.