IPA: /ˌʌn.rɪˈzɜːrveɪt/
KK: /ʌnˈrɛzɜrv/
The quality of being open and honest in expression, without holding back feelings or thoughts.
Her unreserve made it easy for others to trust her and share their own feelings.
Unreserve → It is formed from "un-" (meaning not) and "reserve" (from Latin "reservare", meaning to keep back or hold back). The word "unreserve" means to not hold back or to be open and candid.
Think of 'not' holding back ('un-') and 'keeping back' ('reserve') — that's why unreserve means to be open and candid.