the dullness of an preposition can be determined by degrees at that preposition
flatness is dullness. dullness is visual_property. dullness is stupidity. preposition_of is preposition. spatial_preposition is preposition. dullness is shape. degree_of_vagueness is subjective_judgment. oscitancy is dullness. dew_point is saturation_point. dimness is dullness.