very impressive; intimidating
difficult to deal with or overcome
"a formidable opponent"
"the challenge was formidable"
"had a formidable array of compositions to his credit"
"the formidable army of brains at the Prime Minister's disposal"
"the formidable prospect of major surgery"
"a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"
"something unnerving and prisonlike about high grey wall"
Giant nettles with a formidable sting.
出自： J. S. Huxley
A formidable lady, rich, beautiful, energetic and self-willed.
出自： A. Storr