The term 'sickly looking' can be described by four words found in a crossword puzzle: GREENISH (8 letters), ashen (5 letters), WAN (3 letters), and SALLOW (6 letters). GREENISH is an adjective used to describe something that has a slightly yellowish or bluish tinge. Ashen is an adjective used to describe something that is pale or grayish in color. WAN is an adjective used to describe someone who looks weak, pale, or sickly. Lastly, SALLOW is an adjective used to describe someone who has a yellowish complexion, often due to illness. All of these words together can be used to describe someone who looks sickly.