Áhyggjast

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

áhyggjast

(að), v. refl., á. e-t or um e-t, to be concerned about, take care or thought for.

Possible runic inscription in Younger Futhark:ᛅᚼᚢᚴᚴᛁᛅᛋᛏ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary