无偿 wúcháng free
free; no charge; at no cost
How to remember 无偿: 无 have not + 偿 to repay = free.
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How it is used
- Free of charge / unpaid - 无偿服务 (wúcháng fúwù) service provided free, 无偿献血 (wúcháng xiànxuè) voluntary (unpaid) blood donation.
- Formal; stresses that no payment is involved, often for aid, labor, or donations. Opposite 有偿 (yǒucháng, for a fee) - 有偿服务 (yǒucháng fúwù) a paid service.