sickness的形容词形式是sick；
sick：adj.(身体或精神)生病的，有病的；想呕吐；晕船；晕机；
sickness：n.疾病；不健康；…病；…症
I was sick three times in the night.
夜里我吐了三次。
The very thought of drink made him feel sick.
他一想到酒就觉得恶心。
People think I'm sick for having a rat as a pet.
人们认为我养只耗子当宠物是变态。
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