Possessing or showing energy; active and vigorous (archaic or rare variant of 'energetic').
From Greek energikos, derived from energeia 'activity, operation' (en- 'in' + ergon 'work'). This is a less common form that largely gave way to the modern 'energetic,' which is more regular in formation.
Before 'energetic' became standardized, English had multiple competing forms like 'energic'—it's a reminder that languages constantly prune their vocabulary, with some words winning out while others fade into rare usage.
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