Bitter

Bitter refers to one of the five basic tastes, characterized by sharp, pungent flavors that can be unpleasant in certain contexts. It is often associated with substances that may be toxic or harmful, which is why humans tend to detect bitterness instinctively. Common examples include foods like bitter greens (kale, arugula) and beverages like coffee or certain types of beer. In a broader sense, "bitter" can also describe a feeling of resentment or unpleasantness in personal relationships or situations, reflecting a sense of disappointment or sorrow over past experiences.