"In sensibility" refers to a lack of sensitivity or emotional responsiveness. There are several synonyms that can be used to convey the same meaning, such as insensitivity, numbness, unfeelingness, callousness, and apathy. Insensitivity implies a lack of consideration or care for others' feelings, while numbness suggests a lack of emotional response due to trauma or shock. Unfeelingness and callousness imply a deliberate indifference towards others' emotions. Apathy suggests a lack of interest or concern towards anything at all. All of these terms denote a lack of emotional connectedness or empathy, which can have negative impacts on personal relationships and interactions with others.