IPA: //ˌʌn.kənˈstrɪk.tɪd//
KK: /ʌn.kənˈstrɪk.tɪd/
Not limited or restricted in any way; free and open.
The unconstricted flow of the river allowed for easy navigation.
Unconstricted → It is formed from "un-" (meaning not) and "constricted" (from Latin "constringere", meaning to bind tightly). The word "unconstricted" means not bound tightly or free from tightness.
Think of 'not' ('un-') being added to 'bound tightly' ('constricted') — that's why unconstricted means free from tightness.