IPA: /ʌnˈhoʊliər/
KK: /ʌnˈhoʊliər/
More sinful or morally wrong than something else.
His actions were considered unholier than those of his peers.
Unholier → It is formed from "un-" (meaning not) and "holy" (from Old English "halig", meaning sacred or consecrated) and the comparative suffix "-er" (indicating a higher degree). The word "unholier" means more not sacred or less holy than something else.
Think of 'not' ('un-') combined with 'sacred' ('holy') to remember that 'unholier' describes something that is less sacred or more profane.