She was disappointed by his lack of initiative.

她对他缺乏主动性感到失望。

《柯林斯英汉双解大词典》

Furthermore, there comes a point where studied distance begins to look like plain old lack of initiative.

ECONOMIST: Uncle Sam to the rescue

Turcotte said he encountered a similar lack of initiative among officials from former Warsaw Pact officials after the fall of the Berlin Wall.

MSN: An occupation without precedent

Moshe Kantor, president of the European Jewish Congress, also criticized Orban's perceived lack of initiative and called for an outright ban of Jobbik even if it meant curbing democracy.

NPR: Hungary's Prime Minister Denounces Anti-Semitism