Quite a few one-words to describe The Sil (aka a summary of what has been said):
 

Terse (Mac)
Formidable (Esty)
Mythic (Selmo)
Glacial (Lal)
Fateful (Ang)
[A] jewel (Bb)
Deep (Ninja91)
Better (Eomer)
Magic (TM)
Disjointed (Morm)
Fey (Mith)
Engaging (Valier)
Complex (Brinn)
Depressing (symestreem)
Unfortunate (Lhuna)
Tragic (Elempi)
Multi-charactered (Firefoot)
Sweeping (Elempi)
Overpowering (Captain Grishnahk)
Splintered (Elempi)
Cynical (Alatar)
"Totally" (Alatar)
Tome-ish (Alatar)
Preliminary (Pio)
Demanding (Saucie)
Long (Enca)
Morgoth (Child)
Medieval (Child)
Interesting (Gil)
Challenging (Lhuna)
Bold (Elempi)
Lore (TM)
Epic (High King Fingolfin)
Stupendous (Morm)
Doomed! (Guinevere)
Dry (Liriodendron)
Sombre (Guinevere)
Colossal (Galadel Vinorel)
Fate (TM)
Convincing (Legate)
Sacred (Amras Oronar)
Bare-boned (Pio)
"The Bible of ME" (Boromir_bg)
Magnificient (Lommy)
Historical (yavanna II)
Debated (Elempi)
Unfinished (hild)
Ethereal (Elmo)
Compicated (Orominuialwen)
Intense (Shieldmaiden4xsword)
Compelling (Tar-Meneldur)
Doctored (Bb)
Emended (Bb)
Nascent (Pio)
Tertiary (Son of Numenor)
Nutty (Lal)
Layered (Laitoste)
Loss (Thena)
Revealing (luthien-elvenprincess)
nakakapagpabagabag (Lhuna)
"The 'l' of a story" (Bb)
Bleak (ADubiousSource)
Iluvatar (ADubiousSource)
Tragedy (Thena)
Destiny (Thena)
History (Thena)
Bible (Thena)
Lumenyáre (Thena)
Revelation (Neithan Tol Turambar)
Christopher (narrforc)
Overcomplex (Sir Kohran)
Norse (LjósÁlfr)
Teasing (Sauron The White)
Headache (blood of angels)
Homeric (Andsigil)
Cosmological (Morth)
Short (Rikae)
Novel - in both senses (Valesse)
Fascinating (Groin Redbeard)
Didactic (Ibrin)
Intricate (kementari)
Changed/Edited (Eonwe)
Distant (Siiw)
Elegiac (Lush)
Confusing (TGEW)
Fall (Nilp)
Lovely (Rune)
Archaic (skip)
Broken (Tietäjä)
Enchanting (Agan)
Impossible (Diane C)
Frustrating (TheOrcWithNoName)
Sublime (Eomer)
Grand (Zil)
Eternal (G55)
Nostalgia (Galadriel)
Powerful (G55)
Transcendent (Ozban)
Beautiful (G55)
Emotional (Ren the Unclean)
Rough (Cirdan)
Legendary (oddkins)
Imperfection in perfaction (SlverGlass)
Saga (SlverGlass)
An endowment (SlverGlass)
Captivating (SlverGlass)
Indomitable (spirit_of_fire)
Hope (spirit_of_fire)
Valor (spirit_of_fire)
Sorrow (spirit_of_fire)
Satisfying (Banthro)
Leperous (FlimFlamSam)
Corrupting (FlimFlamSam)
Poisonous (FlimFlamSam)

I think this guy's just trolling, G55– see his post on the "Why is it so difficult" thread.

Galadriel55 spoke: [In that case, we will just have to disagree]
Yeppers.

Nice summation of the exisitng words used in the thread so far.
Good work. :)

Nerwen spoke: [I think this guy's just trolling.]
Yeah... No--that's not it.

FlimFlam–

You do know that just saying you're not a troll by this stage carries about as much weight as insisting that a violet-eyed half-Elf fan-fic heroine is "not a Mary Sue"?

I would like to add WISTFUL.

I agree with everyone who said it was nostalgic or regretful in some way. The gradual diminishing of the world and its tainting - Arda Marred, if you will - is, at least to me, the the most prominent theme of The Silm, even THE theme. Especially so with the last lines, which I don't have on me now.

Here they are:

This is probably my most favourite passage in all the books. I have many favourites (too many for them to be called "favourites"... :rolleyes:), but this sentence is simply unbeatable.

Wait... there's more...

This does indeed summarise the whole Sil.

Yes, that last quote! Exactly what I was trying to say. Tolkien seems to have put it in better words than me. :)

While I absolutely agree with words like "wistful" and "nostalgia", my words seem to be more... erm, now how should I call it? Well, those that describe the impression rather than the book.

Looking at the long list I made earlier, most "words" are either "summaries" (like wistful, loss), "experiences or reading The Sil" (like complicated, headaches, demanding (lol :p... these are not the best experiences)), or "impressions" (like destiny, doomed!, tragedy, sorrow, powerful). Do you get the gist?

Interesting...

Yes, I see it too. And the words describing the experiences of reading the book do seem to be predominantly negative. :(

LOL, agreed! ;D

Hey, that wasn't even my word! ;) :p According to the list blood of angels said that. The Sil didn't give me headaches. Reading it on the bus did. :D

No matter, I still agree with it :p The first time nearly killed me.

Then something happened called 'getting used to the style' :Merisu: