The term 'supercilious one' refers to someone who is arrogant and haughty. This type of person can be described by the crossword solutions SNOOT (5 letters), SNOB (4 letters), and PRIG (4 letters). A SNOOT is someone who is overly proud and disdainful of others, a SNOB is someone who looks down on those of lower social standing, and a PRIG is someone who is excessively prim and proper. All three words describe someone who is overly superior and condescending.