He completed his rotation, the question as always, denied an adequate answer.

There is no adequate answer to that question, because it's the wrong question.

So both 3 and 4 have their reasons for being adequate answers.

Many of those do not have an adequate answer.

If no adequate answer can be found, then what exactly are we paying for?

He considered a dozen possible comments, and finally thought of an adequate answer.

I don't know if age is the adequate answer to what has happened to him.

There are not yet any adequate answers for dealing with the social and economic problems related to this.

"I cannot say we have an adequate answer," he said.

For the next few minutes I asked questions and she failed to give adequate answers.