IPA: //ʌnˈsɛt//
KK: /ʌnˈsɛt/
Not placed in a fixed position or setting; not yet solid or firm.
The unset cement needs more time to harden before we can use it.
Unset → It is formed from the prefix "un-" (meaning not) and the root "set" (from Old English "settan", meaning to place or put). The word "unset" means not set or not placed in a particular position.
Think of 'not' ('un-') having something 'placed' ('set') — that's why unset means something that is not placed or arranged.