The term 'insensitive one' can be described by two crossword solutions: BOOR and CLOD. A BOOR is someone who is rude, insensitive, and lacks social graces. It is derived from the Dutch word 'BOER, ' which means peasant or farmer. A CLOD is someone who is dull-witted, slow to understand, and insensitive. The term is derived from the Old English word 'CLOD, ' which means a lump of earth or clay. Both terms refer to someone who is socially inept and insensitive.