Uncanny – in meaning 4 “not to be trusted as being associated with supernatural arts or powers” – made perfect sense as the opposite of canny – “wise and safe and to be trusted.”  Gandalf is both uncanny and canny in these senses, as he is wise and eminently trustable and good.  This word is a Scottish regionalism and here I am eating another slice of humble pie, as the word is used not for low effect but by painting the picture with mystery and magic, to heighten the passages.

• 04.002 for the echoes were uncanny,
• 06.065 and uncanny fire.
• 08.006 in the enormous uncanny darkness.

“unˈcanny, adj.” OED Online. Oxford University Press, March 2015. Web. 20 May 2015.