Somewhat refined, polite, or upper-class in manner, though perhaps not entirely or genuinely so.
From 'genteel' (refined, elegant, from French 'gentil' meaning noble or well-born) + suffix '-ish' (somewhat, rather), creating an informal diminutive that suggests pretended or partial gentility.
The '-ish' suffix transforms 'genteel' from an absolute judgment into something more forgiving and humorous—it's the linguistic equivalent of saying someone is 'trying a little too hard' to seem fancy.
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