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

See also: senseless

• alchemic
• alchemical
• alchemise
• alchemist
• alchemistic
• alchemistical
• alchemize
• alchemy
• Alcibiades
• Alcidae
• Alcides
• alcohol
• alcohol abuse
• alcohol addiction
• alcohol amnestic disorder
• alcohol group
• alcohol radical
• alcohol thermometer
• alcohol-dependent
• alcohol-in-glass thermometer
• alcohol-soluble
• alcoholic
• alcoholic abuse
• alcoholic beverage
• alcoholic dementia