糟糕 is the everyday exclamation and adjective for 'terrible, awful' — used when something goes wrong or is of very poor quality. Unlike 可怕 (frightening, scary) or 臭 (stinky, lousy), 糟糕 focuses on the situation being bad or unlucky, not on fear or smell. It's also the most common standalone exclamation ('Oh no!') among these synonyms.