From Longman Dictionary of Contemporary Englishfeel lousyfeel lousyspoken if you feel lousy, you feel ill → lousy
Examples from the Corpus
feel lousy• Will you spend the rest of the day feeling lousy?• He had himself escaped, but, he said matter-of-factly, he had always felt lousy about the others.• One time after a close loss, I told him I felt lousy and I didn't want to go shake hands.• I was prepared to feel lousy and to continue to feel lousy.• I feel lousy when I have some terrific game to review and there's no space on my hard drive for it. 