As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- a. vehement, fierce (~ bardagi); þenna dag var veizlan allra áköfust, at the highest pitch; neut. as adv., kalla ákaft á Bárð, to pray to B. fervently; ríða sem ákafast, to ride at a furious pace.
Possible runic inscription in Younger Futhark:ᛅᚴᛅᚠᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.