IPA: /ʌnˈmænli/
KK: /ʌnˈmænli/
The least manly; lacking qualities traditionally associated with masculinity.
He felt that showing his emotions was the unmanliest thing he could do.
Comparative: more unmanly
Superlative: unmanliest
Unmanliest → It is formed from "un-" (meaning not) and "manly" (from Old English "manlic", meaning having the qualities of a man). The suffix "-est" indicates the superlative form. Therefore, "unmanliest" means not having the qualities of a man to the greatest degree.
Think of 'not' ('un-') being added to 'manly' to describe something that lacks manly qualities the most.