The term 'sick-looking' can be described by four words: PALE (4 letters), PASTY (5 letters), SALLOW (6 letters), and WAN (3 letters). PALE is an adjective used to describe a person or thing that is very light in color, often due to illness or lack of health. PASTY is an adjective used to describe a person or thing that has a dull, grayish-white complexion. SALLOW is an adjective used to describe a person or thing that has a yellowish or unhealthy complexion. Lastly, WAN is an adjective used to describe a person or thing that looks weak, PALE, and tired. All of these words can be used to describe someone who is sick-looking.