sightly
couth
gruntled
combobulated
gorm
gormful
pervious
whelm
eff
effable
praved
scrutable
comfited
concerting
(Thanks to my linguistically-talented housemate, Chris, in identifying some of these gems)
No one ever seems to use these words
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MetaGrrrl 
Don’t forget “kempt!”
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Another interesting one: estimated
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There’s a great article called “How I met my wife” that uses a lot of words like this (“Her hair was kempt, her clothing shevelled, and she moved in a gainly way”). One place you can find it (the first hit at Google) is: http://beebo.org/smackerels/how-i-met-my-wife.html
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What about, ” Get out of the effing way” and “Eff an ice day”.
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and then there are all those references to using the EFF word.
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And don’t forget ’embowel’
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What a sightly web page. Frankly, I was whelmed. Very couth of you to gruntle me with pervious words. I find it concerting that I have comfited scrutable grammer quite effably. Now, it’s nearly 5 o’clock and I must commence my nightly recombobulation.
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fenestrate
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There is an estimated 4 trillion dollars that America owes China.
It is used a lot.
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I think she meant to type ‘estimable’.
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