The term 'more fastidious' can be described by four crossword solutions: fussier (7 letters), primmer (7 letters), NEATER (6 letters), and NICER (5 letters). Fussier means to be excessively particular or demanding about details, while primmer means to be excessively neat and proper. NEATER means to be tidier or more orderly, and NICER means to be more pleasant or attractive. All of these words together describe someone who is more fastidious, or more particular and demanding about details, neatness, and pleasantness.