IPA: /ʌnˈmænɪdʒəblɪ/
KK: /ʌnˈmænɪdʒəbli/
In a way that cannot be controlled or managed; excessively difficult to handle.
The project became unmanageably complex, causing delays and confusion.
Unmanageably → It is formed from "un-" (meaning not), "manage" (from Old French *managier*, meaning to handle or control), and "-able" (meaning capable of). The word "unmanageably" means not capable of being handled or controlled.
Think of 'not' ('un-') being able to 'handle' something ('manage') — that's why unmanageably means something that cannot be controlled.