As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- m. eagerness, vehemence; með ákafa miklum, vehemently; í ákafa, eagerly, impetuously; the gen. ‘ákafa’ is prefixed to a great many adjectives and to some substantives, in the sense of in a high degree, very; ákafa fagr, very beautiful; ákafa reiðr, very angry, furious; ákafa drífa, a heavy snow-drift.
Possible runic inscription in Younger Futhark:ᛅᚴᛅᚠᛁ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.