American Heritage Dictionary
(3)
Century Dictionary
(7)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Pythons are masters of disguise -- slippery and quick -- and all but one of the serpents was invisible within minutes of being deposited into the pit.— WSBTV.com - Local News
I mean, it's right out of the freezer, it's cold, slippery, and maybe a little wet from the humidity.— Anime Nano!
"De rocks am slippery, an' you kin twist an ankle widout half tryin', sah I will be careful, Ben.— Young Captain Jack The Son of a Soldier
No 'march past' was necessary or would have been possible, for so slippery was the road that the men had to trail along its untrodden sides as best they could.— The Story of the 2/4th Oxfordshire and Buckinghamshire Light Infantry
The long clear night and the bright morning sunshine had done much toward drying the roads and though they were still rather sticky and slippery, the girls had no difficulty in keeping up a good rate of speed This is something like," cried Grace, as she stretched both arms above her head and breathed deep of the balmy air.— The Outdoor Girls at Bluff Point Or a Wreck and a Rescue

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a week.