unforgiving
adjective
1 unforgiving
Unwilling or unable to forgive or show mercy.
2 unforgiving
Not to be placated or appeased or moved by entreaty.
synonyms: grim, inexorable, relentless, stern, unappeasable, unrelenting.
Roget 919: revengeful, vengeful; vindictive, rancorous; pitiless etc. 914.1; ruthless, rigorous, avenging. unforgiving, unrelenting; inexorable, stony-hearted, ... show more
Moby thesaurus: bowelless, cruel, dog-eat-dog, flinty, hard, harsh, heartless, inclement, inexorable, merciless, pitiless, relentless, remorseless, ruthless, uncompassionate, uncompassioned, unfeeling, unmerciful, unpitiful, unpitying ... show more.
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