undiagnosable
adjective
un·di·ag·nos·able ˌən-ˌdī-ig-ˈnō-sə-bəl 
-əg-,
-zə-
: incapable of being diagnosed : not diagnosable
an undiagnosable illness/problem
Example Sentences
Recent Examples on the Web The older the former player, the less likely that diseases like Alzheimer’s, ALS or dementia can be attributed solely to football; CTE remains undiagnosable in the living. 
S.l. Price, SI.com, 9 May 2017 At age 15, Marsella had undiagnosable auto-immune issues. CBS News, 7 July 2017
S.l. Price, SI.com, 9 May 2017 At age 15, Marsella had undiagnosable auto-immune issues. CBS News, 7 July 2017 Word History
First Known Use
1926, in the meaning defined above
Medical Definition
undiagnosable
adjective
un·di·ag·nos·able -ˌdī-ig-ˈnō-sə-bəl
: not capable of being diagnosed
an undiagnosable complaint
- monogamously
- monogamousnesses
- monogamy
- monoganglionic
- monogastric
- Monogena
- monogene
- monogenean
- monogeneans
- head-scratchers
- head-scratching
- head-scratchings
- head-to-head
- head/mind games
- headache
- headache plant
- headache post
- headache weed
- headaches
- headachey
- headachier
- headachiest
- headachy
- headband
- headbands