1. Not paid
   "unpaid wages"; "an unpaid bill" 
2. Without payment
   "the soup kitchen was run primarily by unpaid helpers"
   - volunteer 
3. Engaged in as a pastime
   "unpaid extras in the documentary"
   - amateur, recreational

See also: buckshee [Brit], complimentary, costless, due, free, gratis, gratuitous, non-paying, nonprofessional, outstanding, owing, pro bono, rent-free, uncompensated, undischarged, unsalaried, voluntary

Antonym: paid

• Hydrophidae
• hydrophilic
• hydrophobia
• hydrophobic
• hydrophobicity
• hydrophone
• Hydrophyllaceae
• Hydrophyllum
• Hydrophyllum virginianum
• hydrophyte
• hydrophytic
• hydrophytic plant
• hydroplane
• hydroplane racing
• hydroponic
• hydroponics
• hydropower
• hydrops
• hydroquinone
• hydrosphere
• hydrostatic
• hydrostatic head
• hydrostatical
• hydrostatics
• hydrotherapy