At 5:32:54 PM on Thursday, September 3, 2009, Scott wrote:

> Is Modern Icelandic mutually unintelligible with Old
> Norse?

There have been some pretty extensive sound changes. There
have also been semantic shifts, not to mention a good deal
of new lexicon. In the personal pronouns the dual has
replaced the plural in the first and second persons. There
have been some changes in the endings of the mediopassive
and subjunctive. I'm pretty sure that there have been some
changes in sentence-level syntax as well, but I don't know
enough to say just what they are, and I doubt that they're a
very formidable obstacle to understanding.

My best guess is that a fluent speaker of modern Icelandic
wouldn't have too much trouble with classical ON once he got
used to the sound changes. To make matters a bit easier, in
many cases the modern spelling actually points to the older
sound; <au>, <y>, and <ý> are good examples of this. I
suspect that comprehension in the other direction would be
harder but possible, especially if the modern speaker made a
real effort to be cooperative.

Brian