物憂ものう
monōi

i-Adjective

1. languid; weary; listless; melancholy

そして、どうすることも出来できない物憂ものうさに、ふっとためいきをつく。
soshite dō suru kotomo dekinai monōsani futto tameikio tsuku.
And then I breathe a sigh from melancholy in being unable to do anything about it.
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