cleverly

This is what had happened: Andrea had very cleverly managed to descend two-thirds of the chimney, but then his foot slipped, and notwithstanding his endeavors, he came into the room with more speed and noise than he intended.

So cleverly was the colonel concealed that, even when the Moriarty gang was broken up, we could not incriminate him.

It was cleverly done.

Stapleton himself seems to have been capable of jealousy, and when he saw the baronet paying court to the lady, even though it was part of his own plan, still he could not help interrupting with a passionate outburst which revealed the fiery soul which his self-contained manner so cleverly concealed.