IPA: /ɪmˈpræktɪkəbli/
KK: /ɪmˈpræktɪkəbli/
In a manner that is not practical or feasible; not able to be done or achieved.
The plan was impracticably ambitious, making it impossible to execute successfully.
Impracticably → It is formed from "im-" (meaning not), "practicus" (from Latin, meaning practical or able to be done), and "-ably" (meaning in a manner). The word "impracticably" means in a manner that is not practical or not able to be done.
Think of 'not' ('im-') being combined with 'practical' ('practicus') to remember that 'impracticably' means something that cannot be done in a practical way.