1. In a meaningless and purposeless manner
   "these innocent bystanders were senselessly killed" 
2. In an unreasonably senseless manner
   - mindlessly

See also: senseless

• copter
• Coptic
• Coptic Church
• Coptis
• Coptis groenlandica
• Coptis trifolia groenlandica
• copula
• copular
• copulate
• copulation
• copulative
• copulative conjunction
• copulatory
• copy
• copy editing
• copy editor
• copy out
• copy-and-paste
• copybook
• copycat
• copyedit
• copyhold
• copyholder
• copying
• copyist