Úyfirstigligr

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

úyfirstigligr

a. insurmountable.

Possible runic inscription in Younger Futhark:ᚢᚢᚠᛁᚱᛋᛏᛁᚴᛚᛁᚴᚱ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norwegian - Johan Fritzner's Dictionary