FASTIDIOUSNESS is a quality of being very particular and demanding in one's standards. REFINEMENT (10 letters) is the process of making something more sophisticated or elegant. CULTIVATION (11 letters) is the act of developing or improving something over time. FUSSINESS (9 letters) is the quality of being overly concerned with details. SPITANDPOLISH (13 letters) is an idiom that refers to the process of making something perfect. NICETY (6 letters) is a small detail or feature that adds to the overall effect. All of these words can be used to describe the quality of fastidiousness, which is the act of being extremely meticulous and exacting in one's standards.