IPA: /ʌnˈʃeɪkəbli/
KK: /ʌnˈʃeɪkəbli/
In a way that cannot be changed or moved; firmly and confidently.
She believed in her decision unshakably, despite the doubts of others.
Unshakably → It is formed from "un-" (meaning not) and "shakable" (from Old English "sceacan", meaning to move or tremble) and the suffix "-ly" (meaning in a manner). The word "unshakably" means in a manner that is not able to be moved or disturbed.
Think of 'not' ('un-') being able to 'move' ('shakable') — that's why unshakably means something that cannot be disturbed.