1. Not brought about by coercion or force
   - uncoerced, willing 
2. Not resulting from undue effort; not forced
   "a voice with a pleasingly unforced quality"
   - unstrained

See also: effortless, voluntary

• police officer
• police precinct
• police sergeant
• police squad
• police state
• police station
• police van
• police wagon
• police work
• policeman
• policeman bird
• policewoman
• policy
• policy change
• policy maker
• policy-making
• policyholder
• polio
• poliomyelitis
• Polioptila
• poliosis
• poliovirus
• poliovirus vaccine
• polis
• polish