Skjálfa

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

skjálfa

(skelf; skalf, skulfum; skolfit), v. to shiver, shake, quiver (honum þótti s. bæði jörð ok himinn); þeygi henni hendr skulfu, her hands faltered not at all.

Possible runic inscription in Younger Futhark:ᛋᚴᛁᛅᛚᚠᛅ

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