IPA: /ʌnˈlaɪk.lɪ.nəs/
KK: /ʌnˈlaɪklnəs/
The quality or state of not being likely to happen or occur; the chance that something will not happen.
The unlikeliness of winning the lottery makes it a poor investment.
Unlikeliness → It is formed from "un-" (meaning not) and "likely" (from Old English "liclic", meaning having the characteristics of). The suffix "-ness" (meaning the state or quality of) indicates a state of being. Therefore, "unlikeliness" refers to the state of not being likely or probable.
Think of 'not' ('un-') and 'having the characteristics of' ('likely') to remember that 'unlikeliness' means the state of not being likely.