任まかせっきり

noun

leaving everything up to someone else; entrusting completely

Often implies a hands-off approach where one person delegates entirely to another, sometimes with a nuance of neglect or over-reliance.

• 彼かれに任まかせっきりで、私わたしは何なにもしていない。

  I've left everything up to him and haven't done anything myself.

• 仕し事ごとを部ぶ下かに任まかせっきりにするのは良よくない。

  It's not good to leave all the work to your subordinates.