IPA: /ˈɡleɪʃəli/
KK: /ˈɡleɪʃəli/
In a manner that is very slow or cold, similar to the movement of glaciers.
The project progressed glacially, taking much longer than expected.
Glacially → It is formed from "glacies" (meaning ice) and the suffix "-ally" (meaning in a manner). The word "glacially" means in a manner that is icy or extremely slow, reminiscent of the movement of glaciers.
Think of 'ice' ('glacies') to remember that 'glacially' describes something that is done in an icy or very slow manner.