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Pronounced sneek-lee-nis or sneek-uh-lee-nis. Either is just as acceptable as the last.

1. The ability to be sneaky, covert, or undercover.

2. The ability to sneak stylishly, often coming into close calls with being caught, but then charismatically escaping. Possibly pleasing an audience.
1. That dude has some insane sneakliness going on.
by The Real Cthulhu February 21, 2007