IPA: /ɪnˈkeɪpəbli/
KK: /ɪnˈkeɪpəbli/
In a way that shows a lack of ability or capacity to do something.
She incapably tried to fix the broken machine, but it only got worse.
Incapably → It is formed from "in-" (meaning not) and "capable" (from Latin "capabilis", meaning able to hold or contain) and the suffix "-ly" (meaning in a manner). The word "incapably" means in a manner that is not able or unable to do something.
Think of 'not' ('in-') being combined with 'able' ('capable') to remember that 'incapably' means unable to do something.