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English word formidable comes from Latin formido (Fear, alarm, terror, dread. Fright, horror.), Latin formidare
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formido (Latin)
Fear, alarm, terror, dread. Fright, horror.
formidare (Latin)
formidabilis (Latin)
Causing or inspiring fear, terrible, frightening, formidable.
formidable (Middle French)
formidable (English)
Causing fear, dread, awe, or discouragement as a result of size, strength, or some other impressive feature; commanding respect; causing wonder or astonishment.. Difficult to defeat or overcome.