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uncrackability
uncrackability n. 
/ʌŋˌkrakəˈbɪlᵻti/,
Brit. /ʌnˌkrakəˈbɪlᵻti/
, /ʌnˌkrakəˈbɪlᵻti//ʌŋˌkrakəˈbɪlᵻti/U.S. /ˌənˌkrækəˈbɪlədi/
/ˌənˌkrækəˈbɪlədi/ΚΠ
1923 Daily Mail 10 Jan. 9 (advt.) The Vitreosil Globe, because of its ‘uncrackability’, lies close to the mantle.
2007 G. Holden Starting Online Business for Dummies (ed. 5) vi. 164 The encoded numbers that are generated by encryption routines..vary in size depending on the relative strength (or uncrackability) of the security method used.
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