howl at the moon

idiomatic

(idiomatic) To spend considerable time and effort fruitlessly in a hopeless endeavor.

Japanese Meaning

無駄な努力をする / 徒労に終わる行動をとる / 時間と労力を無駄に使う

They continued to howl at the moon even after it was clear the project wouldn't be approved.

プロジェクトが承認されないことが明らかになってからも、彼らはただ無駄に時間と労力を費やし続けていた。

Sense（1）

(idiomatic) To spend considerable time and effort fruitlessly in a hopeless endeavor.

howls at the moon

（ present singular third-person ）

howling at the moon

（ participle present ）

howled at the moon

（ participle past ）

howled at the moon

（ past ）