- not disposed to forgive or show mercy; unrelenting.
- not allowing for mistakes, carelessness, or weakness: the unforgiving nature of aviation.
- not willing to forgive; unmerciful
- (of a machine, system, etc) allowing little or no opportunity for mistakes to be corrected
- harsh and unremittingan unforgiving and desolate landscape
adj.1713, from un- (1) “not” + present participle of forgive.