Webster's English Dictionary

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inert

Cross references:
  1. inactive              
 
in.ert \in-'*rt\ aj [L inert-, iners unskilled, idle, fr. in- + art-, ar]s 
   skill - more at ARM 1: not having the power to move itself  2: deficient in 
   active properties; esp : lacking a usual or antici pated chemical or 
   biological action 3: very slow to move or act : SLUGGISH  - inert n