불안정하다

Deviating from what is normal or usual; abnormal.

To be abnormal or irregular.

Indicating the topic or subject; about, concerning.

To be accumulated or added up over a period of time. It is frequently used to describe the buildup of fatigue, debt, or environmental damage.

General body aches and fatigue, often accompanying a cold or flu.

To suffer from body aches and fatigue, often due to a cold.

To have a dull, throbbing pain; to ache.

Achoo! (onomatopoeia for sneezing).

To be acute or sudden (e.g., an illness).

Having a rapid onset and short course; to be acute (illness).