There are several synonyms for the word "smarted", each with a slightly different meaning and usage. If you're looking for a more subtle alternative, you might consider "stung", which implies a sharp physical pain or discomfort. "Pained" is another option that suggests an emotional or psychological hurt. For a stronger sense of injustice or betrayal, you might choose "burned", which implies a sense of anger or frustration. Other options include "hurt", "suffered", and "agonized", each of which has its own unique connotations and nuances. Ultimately, the right synonym will depend on the context and tone of the sentence you're crafting.