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

• lentil plant
• lentil soup
• Lentinus
• Lentinus edodes
• Lentinus lepideus
• lentisk
• lentissimo
• Struthioniformes
• strutter
• strychnine
• Strymon
• Strymon melinus
• Stuart
• Stuart Davis
• stub
• stub nail
• stub out
• stubbiness
• stubble
• stubbled
• stubbly
• stubborn
• stubbornly
• stubbornness
• Stubbs