Eflaust

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

eflaust

adv. undoubtedly, without doubt (~ má hann þat vita).

Possible runic inscription in Younger Futhark:ᛁᚠᛚᛅᚢᛋᛏ

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