IPA: //ʌnˈsoʊʃəblɪ//
KK: /ʌnˈsoʊʃəblɪ/
In a way that is not friendly or social; avoiding interaction with others.
He behaved unsociably at the party, choosing to sit alone instead of mingling with the guests.
Unsociably → It is formed from "un-" (meaning not) and "sociable" (from Latin "sociabilis", meaning able to be associated with others). The word "unsociably" means not in a manner that is friendly or inclined to associate with others.
Think of 'not' ('un-') being added to 'sociable', which means friendly or inclined to socialize. This helps you remember that 'unsociably' describes behavior that is not friendly or social.