god-awfulˌgod-ˈawful, God-awful, god‧aw‧ful /ˈɡɒdɔːfəl $ ˈɡɑːdɒː-/ adjective [only before noun] 
informal very bad or unpleasant. Some Christian people find this word offensive: 
What’s that god-awful smell?
informal very bad or unpleasant. Some Christian people find this word offensive: What’s that god-awful smell?