Viðgørðarmikill

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

viðgørðarmikill

a. requiring great efforts, dangerous (veðr var hvasst ok viðgørðarmikit).

Possible runic inscription in Younger Futhark:ᚢᛁᚦᚴᚢᚱᚦᛅᚱᛘᛁᚴᛁᛚᛚ