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

See also: unsupported

• wide-body
• wide-body aircraft
• wide-cut
• wide-eyed
• wide-open
• wide-ranging
• wideband
• widegrip pushup
• widely
• widely distributed
• widen
• widener
• wideness
• widening
• widescreen
• widespread
• widgeon
• widget
• widish
• widow
• widow bird
• widow woman
• widow's peak
• widow's walk
• widow's weeds