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

See also: unsupported

Nearest

ground-effect machine
ground-emplaced mine
grounder
groundfish
ground-floor
groundhog
Groundhog Day
ground-hugging
grounding
groundkeeper
groundless
groundlessly
groundlessness
groundling
groundmass
groundnut
groundnut oil
groundnut vine
grounds
groundsel
groundsel bush