Từ điển Anh Việt
"formidable" là gì?

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"- G.H.Johnston; "something unnerving and prisonlike about high grey wall