Webster's English Dictionary

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formidable

for.mi.da.ble \'fo.r-m*d-*-b*l also fo.r-'mid-\ \-ble-\ aj [ME, fr. L 
   formidabilis, fr. formidare to fear, fr. formido f]ear; akin to Gk mormo- 
   she-monster 1: exciting fear {a ~ prospect}  2: having qualities that 
   discourage approach or attack  3: tending to inspire awe or wonder  - 
   for.mi.da.ble.ness n