"formidable" in the adjective sense
1. formidable
extremely impressive in strength or excellence
"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"
2. formidable, redoubtable, unnerving
inspiring fear
"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"
Source: WordNet® (An amazing lexical database of English)
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