むなmunaしいshiiむなmunaしいshii
1.

Describes a state where something expected or desired is absent, resulting in a feeling of loss or futility.

2.

Refers to efforts or actions that yield no meaningful results, leading to a sense of disappointment or insignificance.

3.

Characterizes a situation or existence lacking substance or value, often associated with feelings of emptiness or unfulfillment.

4.

Indicates a transient or unreliable nature, suggesting that something is fleeting or uncertain.

5.

Evokes an image of a being that is lifeless or devoid of spirit, existing without purpose or essence.

Example:

彼は多くの日々をむなしく過ごさなければならなかった。