Úheyriliga

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

úheyriliga

adv. in an unheard-of way, wickedly.

Possible runic inscription in Younger Futhark:ᚢᚼᛁᚢᚱᛁᛚᛁᚴᛅ

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