The term 'CRUMMY FEELING' can be summed up by the crossword solution of 'MALAISE, ' which is a French word meaning a general feeling of discomfort, illness, or unease. It is often used to describe a vague feeling of mental or physical uneasiness, and can be caused by a variety of factors such as stress, anxiety, depression, or even boredom. MALAISE is a common symptom of many illnesses, and can be a sign of an underlying medical condition.