na-adjective, noun
irregular; unsettled; unseasonable
Describes weather, conditions, or bodily functions that are not normal or not following the expected pattern. Often used for bad weather or menstrual irregularities.
今年の夏は天候不順で、野菜が高い。
This summer the weather has been unsettled, so vegetables are expensive.
生理不順で婦人科に行った。
I went to the gynecologist because of irregular periods.