yamu
1.

To reach a point where something that has been ongoing comes to an end, such as rain stopping or a commotion dying down.

2.

To conclude an action or activity without carrying it through, resulting in an unfinished state.

3.

To signify the resolution of matters, marking a definitive ending or transition, often associated with significant events.

4.

To experience a diminishing of feelings or sensations, indicating a decrease in emotional intensity or physical discomfort.

Example:

雨がやみさえすればいいのになあ。

yaむなくmunaku
1.

In a manner that indicates a lack of choice or alternatives, often due to circumstances beyond one's control.

2.

Acting out of compulsion, where the decision is made not from desire but from the pressing demands of a situation.

3.

Engaging in an action because it is the only remaining option, despite personal reluctance or disagreement.

4.

Doing something as a necessary means to an end, despite personal discomfort or hesitation.

Example:

私はやむなく薬をのまされた。