IPA: /ʌnˈtʃɛkəbl/
KK: /ʌnˈtʃɛkəbl/
Not able to be verified or confirmed.
The results of the experiment were uncheckable due to lack of data.
Uncheckable → It is formed from "un-" (meaning not) and "check" (from Old English *cecan*, meaning to examine or verify) and "-able" (meaning capable of). The word "uncheckable" means not capable of being examined or verified.
Think of 'not' ('un-') being added to 'check' which means to examine, and '-able' means capable. So, uncheckable means something that cannot be examined.