malicious

/məˈlɪʃəs/
adjective
  1. Intending or showing a desire to cause harm or suffering to others.
    • Spreading malicious lies about someone can destroy their reputation.
    • The malicious email was designed to trick people into giving away their passwords.
    • She gave a malicious smile when she saw her coworker make a mistake.
  2. Relating to software or code designed to damage or disrupt computer systems.
    • Antivirus programs help protect your computer from malicious threats.
    • The company's network was attacked by malicious software that encrypted all files.
    • Always be careful not to click on links that might contain malicious code.