igly. See ugsome.

ugsome. horrid, loathsome.  Frequent almost to the 17th century; revived by Scott in THE ANTIQUARY (1816): Like an auld dog that trails its useless ugsome carcass into some bush or bracken.  … Also ugglesome, uglisome (16th century) … A stronger form of ugly (which Chaucer in THE CLERK’S TALE, 1386, spells igly).

– Dictionary of Early English by Joseph T. Shipley (1955).