Webster's English Dictionary

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precarious

Cross references:
  1. dangerous             
 
pre.car.i.ous \pri-'kar-e--*s, -'ker-\ aj [L precarius obtained by 
   entreaty, uncertain - more at PRAYER] archaic  1: depending on the will or 
   pleasure of another  2: dependent on uncertain premises : DUBIOUS  3a: 
   dependent on chance circumstances, unknown conditions, or uncertain de 
   velopments 3b: characterized by a lack of security or stability that 
   threatens with d anger - pre.car.i.ous.ly av