Sentence:  Oh I really should have known by the time you drove me home, / By the vagueness in your eyes, your casual good-byes, / By the chill in your embrace and the expression on your face, / That told me you might have some advice to give / On how to be <WSD>insensitive</WSD>. 
Meaning of the word marked with <WSD> tags:  Not expressing normal emotional feelings; cold; tactless; undiplomatic