IPA: /ɪnˈkeɪpəblnəs/
KK: /ɪnˈkeɪpəblnəs/
The quality of not being able to do something or lacking the ability to perform a task.
His incapableness in handling the project led to its failure.
Incapableness → It is formed from "in-" (meaning not), "capable" (from Latin "capabilis", meaning able to hold or contain), and "-ness" (meaning the state of being). The word "incapableness" refers to the state of being not able or unable to do something.
Think of 'not' ('in-') combined with 'able' ('capable') and the state of being ('-ness') — this helps you remember that incapableness means the state of being unable.