1. Eluding diagnosis
   "undiagnosed disease"

See also: unknown

• ground tackle
• ground water
• ground wave
• ground zero
• ground-controlled approach
• ground-effect machine
• ground-emplaced mine
• ground-floor
• ground-hugging
• ground-service crew
• ground-shaker
• groundball
• groundberry
• groundbreaker
• groundbreaking
• groundbreaking ceremony
• groundcover
• grounder
• groundfish
• groundhog
• Groundhog Day
• grounding
• groundkeeper
• groundless
• groundlessly