In the song 'Auld Rob Morris' the last verse is thus...

O had she been but of a laigher degree,
I then might have hop'd she wad smil'd upon me!
O, how past descriving had then been my bliss,
As now my distraction no words can express!

O.K., What the heck did he mean by the word DESCRIVING?

I am clueless...ttr