1. Without intellectual involvement
   "all day long, he mindlessly filled out forms" 
2. In an unreasonably senseless manner
   "these temples were mindlessly destroyed by the Red Guards"
   - senselessly

See also: mindless

• in-chief
• in-depth
• in-fighting
• in-house
• in-joke
• in-law
• in-line skate
• in-migration
• in-person
• in-service
• in-situ
• in-tray
• in-your-face
• inability
• inaccessibility
• inaccessible
• inaccessibly
• inaccuracy
• inaccurate
• inaccurately
• Inachis
• Inachis io
• inaction
• inactivate
• inactivation