IPA: /ˈwɒntɪdnəs/
KK: /ˈwɒntɪdnəs/
The quality or state of being used to something or being familiar with it.
His wontedness to the routine made it easy for him to adapt to changes.
Wontedness is formed from "wont" (from Old English *wont*, meaning accustomed or used to) and "-edness" (a suffix indicating a state or condition). The word "wontedness" refers to the state of being accustomed or habitual.
Think of being 'accustomed' to something — that's what 'wontedness' means, the state of being used to something.