IPA: /ɪˈnɜːrʃəli/
KK: /ɪˈnɜrʃəli/
In a way that relates to or is caused by inertia, which is the tendency of an object to remain at rest or in uniform motion unless acted upon by an external force.
The spacecraft moved inertially through the vacuum of space, unaffected by external forces.
Inertially → It is formed from "inert" (from Latin "iners", meaning inactive or idle) and "-ially" (a suffix forming adverbs meaning in a manner of). The word "inertially" refers to acting in a manner that is inactive or lacking motion.
Think of 'inactive' ('inert') and how it describes something that behaves in a way that lacks movement or action.