Irregular or unseasonable; changeable or unsettled (often used for weather, condition, or rhythm).
最近は天気が不順で洗濯物が乾かない。
Lately the weather has been unsettled, and laundry doesn't dry.
体調が不順で会社を休んだ。
I was out sick due to irregular physical condition.
女性はホルモンの影響で生理が不順になることもある。
Because of hormonal effects, women may have irregular menstrual cycles.