say it: FAWR-muh-duh-buhl
formidable is an adjective meaning "extremely impressive in strength or excellence". It carries 2 recorded senses.
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”
inspiring fear
“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”
Definitions, synonyms and semantic relations for formidable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.