IPA: /rɪˈzɜːrvd.nəs/
KK: /rɪˈzɜrvd.nəs/
The quality of being quiet, shy, or not showing one's feelings openly.
Her reservedness made it difficult for her to make new friends at the party.
Reservedness → It is formed from "reserved" (from Latin "reservare", meaning to keep back or hold back) and the suffix "-ness" (meaning the state or quality of). The word "reservedness" refers to the quality of being reserved or holding back one's thoughts or feelings.
Think of someone who is 'holding back' ('reservare') their emotions or thoughts, which is why they are described as having reservedness.