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The term that best refers to a strong feeling of resentment regarding unfair treatment is "grievance." A grievance typically involves a complaint or a sense of injustice that arises when an individual feels wronged or treated unfairly, often in a formal context such as the workplace or within legal settings. This term encapsulates a deeper emotional response tied specifically to perceived unfairness, making it distinct from other options.

Indignation, while also related to feelings of unjust treatment, emphasizes a more intense emotional reaction that often includes anger. Annoyance conveys a milder irritation or displeasure and does not necessarily imply a sense of deep wrongdoing. Discontent refers generally to dissatisfaction but lacks the connotation of an injustice or unfair treatment that characterizes a grievance. Thus, "grievance" serves as the most precise term for a strong feeling of resentment in the context described.