Strong, healthy, and full of energy; or done with great force and intensity.
From Old French 'vigorous,' derived from Latin 'vigorous' (strong, forceful), related to 'vis' (force, energy).
The Latin root 'vis' (force) also gave us 'vigor,' 'vim,' and 'obvious'—all stemming from the idea of force: obvious is what can't be ignored by force.
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