viable

able to live or work successfully

Roots

-able / -ible: able to be, fit to be, or worthy of
viv / vit: life or alive

Other words with the viv / vit root

convivial: friendly and lively in company
revive: to bring back to life or energy
survive: to remain alive or continue despite danger
vital: essential; full of life
vitality: lively energy or life force
vivacious: lively and animated
vivid: bright, lively, or clear

Viable means life-able: a plan survives contact with reality.

Her backup plan was simple but viable.

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