IPA: //ʌnˈrɛstreɪnt//
KK: /ʌnˈrɛstreɪnt/
The state of being free from control or limits; lack of restrictions on behavior or actions.
The protest was marked by a sense of unrestraint, as people expressed their opinions freely.
Unrestraint → It is formed from "un-" (meaning not) and "restraint" (from Latin "restringere", meaning to bind back or hold back). The word "unrestraint" means the state of not being held back or restricted.
Think of 'not' ('un-') being applied to 'holding back' ('restraint') — that's why unrestraint means a lack of restriction.