You can opt-out underline the links using the new option on customizer > web page design > general design options.
I used also this CSS on my child-theme, but not needed with the customizer option:
article.post .entry-inner a,
article.post .entry-inner a:link {
text-decoration: none;
}
If you want to overwrite a CSS rule of the Hueman Theme you have to be more specific (CSS Specificity).
