How is something described as poignant?

Something described as poignant conveys a sense of deep emotional impact or significance, often causing strong feelings of sadness, empathy, or nostalgia. The term suggests that the experience or memory provokes a heartfelt response, making it resonate profoundly with those experiencing it. This can relate to literature, art, or personal experiences that touch on themes of love, loss, or human connection.

The other options do not align with this emotional depth. For instance, describing something as shallow and unimportant suggests a lack of significance or depth, which starkly contrasts the profound nature of poignancy. Similarly, labeling something as unexpectedly humorous or extremely dull does not capture the essence of being emotionally stirring or impactful, which is central to understanding why "deeply affecting or touching" is the right choice.