Ultrasensitive is a term that refers to something being extremely responsive or reactive to a stimulus. When describing the same attribute in varied use cases, one may choose alternate expressions like hyper-responsive, keen, acute, heightened, or delicate. Another related phrase is hypersensitized, which points to having a heightened state of sensitivity due to a chronic ailment or ailment flare-up. A more colloquial option could be 'allergic' to describe an approach or individual who treats something with over-sensitivity, leading to an imbalanced or extreme response. These synonyms enable a writer or speaker to vary the descriptor for the same attribute in different contexts, avoiding repetition and enhancing the vocabulary.