1.
not straightforward or candid; giving a false appearance of frankness
2.
marked by skill in achieving a desired end especially with cunning or craft
the artful dodger
an artful choice of metaphors
The following are synonyms for 'artful'. Click on any of them to get both Bibliodata's full list of common definitions and a further set of synonyms.
There was a post office on the Russian space station Mir. Visiting cosmonauts would use unique postal "markers" to stamp envelopes and other items as having flown aboard the Mir space station.