The quality or state of being refined, polite, and elegant in manner or appearance.
From 'genteel' + '-ness' (state or quality), creating a standard noun form that describes the abstract concept of genteel behavior and appearance.
Interestingly, 'genteelness' is often used somewhat ironically in literature to critique characters who are *trying too hard* to appear refined, making it a literary tool for social satire.
Complete word intelligence in one call. Free tier — 50 lookups/day.