IPA: /ʌnˈlaɪkliɪst/
KK: /ʌnˈlaɪkliest/
The least likely to happen or be true.
She was the unlikeliest candidate to win the competition, but she did.
Comparative: more unlikely
Superlative: unlikeliest
Unlikeliest → It is formed from "un-" (meaning not), "like" (from Old English "lic", meaning similar or alike), and "-liest" (a superlative suffix indicating the highest degree). The word "unlikeliest" means the least likely or not similar in the highest degree.
Think of 'not' ('un-') and 'similar' ('like') to remember that 'unlikeliest' means the least similar or least likely to happen.
No commonly confused words.