for lack of trying

Prepositional phrase

in the negative

(chiefly in the negative) Due to a failure to make a significant enough effort.

Japanese Meaning

十分な試みがなかったために / 努力が不十分だったために / 試みが十分でなかった結果として

She didn't get the promotion, not for lack of trying, but because the company was downsizing.

彼女は昇進を逃したが、十分に努力しなかったためではなく、会社が縮小していたためだった。

Sense（1）

(chiefly in the negative) Due to a failure to make a significant enough effort.

The solution has not yet been found, and it has not been for lack of trying.