WordNet sense 1 (an often persistent bodily disorder or disease; a cause for complaining):

ailment, complaint

WordNet sense 2 (mildly physically distressed):

upset, upset

WordNet sense 3 (feeling nausea; feeling about to vomit):

nauseated, nauseous, queasy, sick, sickish

WordNet sense 4 (somewhat ill or prone to illness):

ailing, indisposed, poorly, unwell

WordNet sense 5 (grievously affected especially by disease):

afflicted

WordNet sense 6 (characterized by enmity or ill will):

hostile

WordNet sense 7 (causing or capable of causing harm):

harmful

WordNet sense 8 (having undesirable or negative qualities):

bad

WordNet sense 9 (presaging ill fortune):

inauspicious, ominous

WordNet sense 10 (unfavorably or with disapproval):

badly