Graidely seems an alternative spelling to ‘gradely’ which means fine and good; promising and likely; being in good health or physically attractive; fitting and proper.
“He’s took a graidely fancy to thee. He wants to see thee and he wants to see Soot an’ Captain.”
Source: Frances Hodgson Burnett, The Secret Garden, illus. Inga Moore (London: Walker Books, 2009) (1911), p. 197