Longest word without repeating a letter?

Not even a try? Well then, I'll give you a hint:
It has 15 letters...

I'll need time to think about this, or should I say, look it up!

2nd hint:

all the five vowels occur...

It's a bit difficult, and I still haven't had time to find it. Give it a couple of days in case someone else knows it.

Ok, I will...
but I don't think it's possible to find such a word when you don't know it... it'll be **** hard to conclude a word like that I'd say...

I tried it, I found 38,000+ words with no letter repetition; the longest were..

dermatoglyphics (15), uncopyrightable (15)

This was from an indexed dictionary of 'normal / regular' words.

Here's the top lot!

15,"dermatoglyphics"
15,"uncopyrightable"
14,"troublemakings"
14,"dermatoglyphic"
14,"ambidextrously"
13,"documentarily"

Overwhelming answer.

And almost all those words come from Latin and some of them from Greek.

I like 'dermatoglyphics' , the folds on skin, I never realised I had dermatoglyphics, beautiful word related to fingerprints.

(Is 'overwhelming' correctly used here?)

WOW, hey you're all fantastic!
uncopyrightable is the word I was thinking of
I haven't known that so far until I was told

uncopywritable

well its repeating a letter but its the longest word with a definiton

pneumonoultramicroscopicsilicovolcanoconiosis

its the name off a disease or something