IPA: /ˌɪnkənˈsiːvəbli/
KK: /ɪnˈkɑnsɪvəbli/
In a way that is impossible to imagine or believe; extremely surprising or difficult to understand.
The results of the experiment were inconceivably different from what we expected.
Inconceivably → It is formed from "in-" (meaning not), "con-" (meaning together), and "capere" (meaning to seize or take). The word describes something that cannot be seized or grasped in understanding, hence it means not able to be conceived or imagined.
Think of something that cannot be 'seized' or 'grasped' in understanding — 'in-' means not, 'con-' means together, and 'capere' means to take.