Synonyms for Unhealthy (same or very similar meaning)
WordNet sense 1 (detrimental to health):
insalubriousWordNet sense 2 (unhealthy looking):
sicklyWordNet sense 3 (caused by or altered by or manifesting disease or pathology):
diseased, morbidWordNet sense 4 (detrimental to good health):
unhealthfulFrom the ODE community, based on WordNetadd/edit