CEDICT
愁闷不安。《晋书．卷七四．桓彝传》：「彝尝去职，至广陵寻亲旧，还遇风，停浦中，累日忧悒。」也作「忧鬱」。
重編國語辭典
This thing can't be rushed; it needs long-term planning.
Source: Tatoeba