IPA: /ʌnˈtʃɜːr.tʃli/
KK: /ʌnˈtʃɜrʧli/
Not related to or appropriate for a church; lacking religious qualities or characteristics.
His unchurchly behavior shocked the congregation during the service.
Unchurchly → It is formed from "un-" (meaning not) and "churchly" (from Old English "cirice" meaning church, with the suffix "-ly" meaning in the manner of). The word "unchurchly" means not in the manner of a church or lacking church-like qualities.
Think of 'not' ('un-') being combined with 'church-like' ('churchly') to remember that 'unchurchly' describes something that is not in the manner of a church.