From Longman Dictionary of Contemporary Englishscrewyscrew‧y /ˈskruːi/ adjective informal STRANGECRAZYan idea or plan that is screwy seems very strange or crazy
Examples from the Corpus
screwy• It was screwy, but so was everything else in this case.• Just another screwy episode in a tournament filled with foibles.• It sounded like a pretty screwy idea to me.• She has these screwy theories about how crystals can cure all kinds of illnesses. 