This word, as anyone can hear, is made of jelly.
Belch-flavoured jelly, at that.
Now, I realise I'm wasting my time, here, because visitors to The Word Den are all people of exquisite taste who would never think of using such a completely disgusting word as genteel in the first place, but just in case some tin-eared interloper has got in* then I suppose I should point out that, unless you want to show the world that you are extremely old-fashioned, have no taste, and are a snob, the word can have no place in your vocabulary.
The wretched word has an offshoot, genteelism: but, like all sane people, I wish it didn't.
Word Not To Use Today: genteel. This word comes from the French gentil, which means well-born, from the Latin gentilis, belonging to the same family, from gens, which means race.
*No, it's all right, you're very welcome anyway.