1. Derived from Prussian blue 
2. Of, or derived from prussic (hydrocyanic) acid
   - hydrocyanic

Encyclopedia: Prussic

• unappetising
• unappetisingness
• unappetizing
• unappetizingness
• unappreciated
• unappreciative
• unappreciatively
• unapprehensive
• unapproachability
• unapproachable
• unappropriated
• unapproved
• unapt
• unarbitrary
• unarguable
• unarguably
• unargumentative
• unarm
• unarmed
• unarmored
• unarmoured
• unarticulate
• unarticulated
• unartistic
• unary