Webster's English Dictionary

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slippery

slip.pery \'slip-(*-)re-\ aj [alter. of ME slipper, fr. OE slipor; akin to 
   MLG slipper sli]ppery, slippen to slip 1a: causing one to slide or fall  
   1b: tending to slip from the grasp  2: not firmly fixed : UNSTABLE  3: not 
   to be trusted : TRICKY