1. Not using intelligence
   - headless

See also: stupid, unintelligent

• slackly
• slackness
• slacks
• slag
• slag code
• slag off
• slagheap
• slain
• slake
• slaked
• slaked lime
• slalom
• slam
• slam dance
• slam dancing
• slam on
• slam-bang
• slam-dunk
• slammer
• slander
• slanderer
• unbalconied
• unbanded
• unbaptised
• unbaptized