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

See also: unsupported

• western hemisphere
• western hemlock
• western holly fern
• Western honey mesquite
• Western Islands
• Western Isles
• western kingbird
• western ladies' tresses
• western larch
• western lowland gorilla
• Western Malayo-Polynesian
• western meadowlark
• Western mountain ash
• western mugwort
• western narrow-mouthed toad
• western omelet
• Western paper birch
• Western pasqueflower
• western pipistrel
• western poison oak
• western poppy
• western prince's pine
• western ragweed
• Western rattlesnake
• western red cedar