adj.
     - protected from or not exposed to danger or risk; not likely to be harmed or lost. 
▸not causing or leading to harm or injury.
 ▸(of a place) affording security or protection.
 - often derogatory cautious and unenterprising.
 - (of an assertion, verdict, etc.) based on good reasons or evidence and not likely to be proved wrong.
 - uninjured; with no harm done.
 - informal excellent.
 
n.
  - a strong fireproof cabinet with a complex lock, used for the storage of valuables.
 - N. Amer. informal a condom.
 
 
  Phrase
  
    
      - to be on the safe side
 in order to have a margin of security against risks. 
    
   
  Derivative
  
  Etymology
  ME: from OFr. sauf, from L. salvus ‘uninjured’.