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undiagnosable
undiagnosable adj. 
/(ˌ)ʌnˈdʌɪəɡnəʊzəbl/, /ˌənˌdaɪəɡˈnoʊsəb(ə)l/, /ˌənˈdaɪəɡˌnoʊzəb(ə)l/, /ˌənˌdaɪəɡˈnoʊzəb(ə)l/
Brit. /ˌʌndʌɪəɡˈnəʊzəbl/
, /ˌʌndʌɪəɡˈnəʊzəbl//(ˌ)ʌnˈdʌɪəɡnəʊzəbl/U.S. /ˌənˈdaɪəɡˌnoʊsəb(ə)l/
, /ˌənˈdaɪəɡˌnoʊsəb(ə)l//ˌənˌdaɪəɡˈnoʊsəb(ə)l//ˌənˈdaɪəɡˌnoʊzəb(ə)l//ˌənˌdaɪəɡˈnoʊzəb(ə)l/ΚΠ
1873 Practitioner Apr. 242 As ‘surgical kidney’ is undiagnosable..every surgeon is justified in running any risks which he may think fit to incur.
1926 Jrnl. Amer. Med. Assoc. 20 Nov. 1721/2 Some intangible,..undiagnosable sinus disease.
2016 Sunday Times (Ireland ed.) (Nexis) 20 Mar. 39 Rose suffers from an undiagnosable condition that prevents her from walking—sometimes.
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