肝心要

Meanings

1. No-adjective, Na-adjective, Noun

   crucial; key; most important; main (point)

• そう言いえば、肝心要かんじんかなめの部分ぶぶんを何なにも決きめていなかった。

  Now that you mention it, I wasn't involved in the decision-making for the vital part.