The term 'not sacred' can be defined by three crossword solutions: SECULAR (7 letters), UNHOLY (6 letters), and UNHALLOWED (10 letters). SECULAR means not related to religion or spiritual matters, while unholiness implies something that is immoral or wicked. Unhallowed is a more extreme version of unholiness, meaning something that is profane or UNHOLY. All three words refer to something that is not considered sacred or holy.