Illness, Sickness, Disease
Noun and の adjective
びょうき
母の病気は、まだよくなりません。
My mother’s illness still hasn’t improved.
おしりからおならが止まらない病気にかかってしまい、外に出られなくなってしまいました。
I got a disease that makes me fart all the time, so I've haven't been able to go outside.
「先生、僕のママの病気、直せるの？」「やってみるけど、当てにしないでね。」
"Can you fix my mom’s illness, doctor?" "I’ll give it a try, but don’t count on it."
When your energy is that of sickness, you are probably sick.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.