"sicker" in the adjective sense
1. ill, sick
affected by an impairment of normal physical or mental function
"ill from the monotony of his suffering"
2. nauseated, nauseous, queasy, sick, sickish
feeling nausea feeling about to vomit
3. brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged
affected with madness or insanity
"a man who had gone mad"
4. disgusted, fed up, sick, sick of, tired of
having a strong distaste from surfeit
"grew more and more disgusted"
"fed up with their complaints"
"sick of it all"
"sick to death of flattery"
"gossip that makes one sick"
"tired of the noise and smoke"
5. pale, pallid, wan, sick
of light) lacking in intensity or brightness dim or feeble
"the pale light of a half moon"
"a pale sun"
"the late afternoon light coming through the el tracks fell in pale oblongs on the street"
"a pallid sky"
"the pale (or wan) stars"
"the wan light of dawn"
deeply affected by a strong feeling
"sat completely still, sick with envy"
"she was sick with longing"
7. ghastly, grim, grisly, gruesome, macabre, sick
shockingly repellent inspiring horror
"the grim aftermath of the bombing"
"the grim task of burying the victims"
"a grisly murder"
"gruesome evidence of human sacrifice"
"macabre tales of war and plague in the Middle ages"
"macabre tortures conceived by madmen"
Source: WordNet® (An amazing lexical database of English)
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