Full of or given to revenge.
Not diminishing in intensity, pace, or effort:
Providing a margin for error or shortcomings.
Difficult to endure; oppressive:
Not relenting; harsh; pitiless
Grim is defined as stern or unmoving.
The definition of cruel is someone or something that deliberately causes pain or suffering.
Find another word for unforgiving. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for unforgiving, like: inexorable, revengeful, avenging, ruthless, unappeasable, unrelenting, forgiving, stern, relentless, grim and cruel.