IPA: /ˌʌnəˈlaɪk/
KK: /ʌnəˈlaɪk/
Not similar or not the same; different from each other.
The two paintings are unalike in style and color.
Comparative: more unalike
Superlative: most unalike
Unalike → It is formed from "un-" (meaning not) and "alike" (from Old English "gelic", meaning similar or like). The word "unalike" means not similar or different from one another.
Think of 'not' ('un-') and 'similar' ('alike') to remember that 'unalike' means not similar.