Webster's English Dictionary

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infirm

Cross references:
  1. weak                  
 
in.firm \in-'f*rm\ aj [ME, fr. L infirmus, fr. in- + firmus firm] 1: of 
   poor or deteriorated vitality; esp : feeble from age  2: weak of mind, 
   will, or character : IRRESOLUTE, VACILLATINGM 3: not solid or stable : 
   INSECURE  - in.firm.ly av