Webster's English Dictionary

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frenetic

fre.net.ic \fri-'net-ik\ \-'net-i-k(*-)le-\ aj [ME frenetik insane, fr. MF 
   frenetique, fr. L phreneticus, mo]dif. of Gk phrenitikos, fr. phrenitis 
   inflammation of the brain, fr. phren-, phre-n diaphragm, mind : FRENZIED, 
   FRANTIC  - fre.net.i.cal.ly av