1. Inspiring fear
   "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"
   - formidable, unnerving, doubtable [archaic] 
2. Worthy of respect or honour
   "born of a redoubtable family"

See also: alarming, reputable

• lanuginous
• lanugo
• lanyard
• Lanzhou
• Lao
• Lao People's Democratic Republic
• Lao-tse
• Lao-tzu
• Lao-zi
• Laocoön
• Laodicean
• Laos
• Laotian
• Laotian capital
• Laotian monetary unit
• lap
• lap choly
• lap covering
• lap joint
• lap of honour
• lap of luxury
• lap of the gods
• lap robe
• lap up
• lap-jointed