enigmatical

As he watched it, the enigmatical light suddenly disappeared.

Let us coolly enquire into this enigmatical affair, Mr. Loveyet.

And, with this enigmatical remark, he abruptly went back to his shack.

To this enigmatical answer the Captain made no immediate reply.

The rest of the face preserved its innocent, tense and enigmatical expression.

By way of answer, Jim twisted his gaunt face in an enigmatical smile.

"Oh, yes; no doubt that is what I must have meant," said Holmes, with his enigmatical smile.

She glanced at Ronny, who returned the glance with an enigmatical smile.

Apart from this enigmatical reference, there were few grounds for hope.

Could any of your correspondents translate this enigmatical line?