Þungræðr

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

þungræðr

a. difficult, laborious.

Possible runic inscription in Younger Futhark:ᚦᚢᚾᚴᚱᛅᚦᚱ

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