unforgiving

1. (figurative) Having no allowance for weakness.Examples: "The unforgiving Arctic climate makes short work of the unprepared."; "In a raucous atmosphere, it was an unforgiving and physical contest from the start. Grant Hanley conceded the first free-kick within the opening 20 seconds, setting the tone for a busy and thankless evening for Serbian referee Milorad Mazic."; "The line may be very scenic, but it runs through areas exposed to some extreme and unforgiving weather that does its worst on station buildings and the infrastructure!"figuratively