noun. ['ˈdʌlnəs'] the quality of being slow to understand.
noun. ['ˈdʌlnəs'] lack of sensibility.
noun. ['ˈdʌlnəs'] the quality of lacking interestingness.
noun. ['ˈdʌlnəs'] a lack of visual brightness.
noun. ['ˈdʌlnəs'] without sharpness or clearness of edge or point.