1. Without a basis in reason or fact
   "the allegations proved groundless"
   - baseless, idle, unfounded, unwarranted, wild

See also: unsupported

• slivery
• slivovitz
• Slo-Bid
• Sloane Ranger
• Sloanea
• Sloanea jamaicensis
• slob
• slobber
• slobber over
• slobberer
• slobbish
• sloe
• sloe gin
• sloe-eyed
• slog
• slogan
• sloganeer
• sloganeering
• slogger
• sloop
• sloop of war
• slop
• slop basin
• slop bowl
• slop chest