Resentment

Name(s): 
Irreconcilability
Unforgiving
Nature

Resentment (also called ranklement or bitterness) is a complex, multilayered emotion that has been described as a mixture of disappointment, disgust and anger. Other psychologists consider it a mood or as a secondary emotion (including cognitive elements) that can be elicited in the face of insult or injury.

Inherent in resentment is a perception of unfairness (i.e. from trivial to very serious), and a generalized defense against unfair situations (e.g. relationships or unfavourable circumstances).

The word originates from French "ressentir", re-, intensive prefix, and sentir "to feel"; from the Latin "sentire". The English word has become synonymous with anger, spite, and holding a grudge.

Source: Wikipedia

Claim 
Holding on to past hurts, old grievances and judgements of others creates disharmony and strengthens the illusion of separateness. Since a person's judgements of others are often a reflection of feelings towards unresolved issues and difficulties in himself, the person's failure in not forgiving others reinforces his own sense of guilt and feelings of unworthiness.
Aggravated by 
Type 
(F) Fuzzy exceptional problems