1. Warding off
   - prophylactic 
2. Serving to warn
   - admonitory, exemplary, monitory, warning

See also: caution, dissuasive, protective

• unsteadiness
• unsteady
• unstep
• unsterilised
• unsterilized
• unstick
• unstilted
• unstimulated
• unstimulating
• unstinted
• unstinting
• unstintingly
• unstirred
• unstop
• unstoppable
• unstoppered
• unstrain
• unstrained
• unstrap
• unstratified
• unstratified language
• unstressed
• unstring
• unstructured
• unstrung