/ ʌnˈhəʊli; NAmE -ˈhoʊ-/ adjective
1.
dangerous; likely to be harmful :
an unholy alliance between the medical profession and the pharmaceutical industry
2.
not respecting the laws of a religion
OPP holy
3.
[ only before noun ] ( informal ) used to emphasize how bad sth is :
She wondered how she had got into this unholy mess.
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WORD ORIGIN
Old English unhālig (see un- , holy ).