formidable

the word formidable entered english in the late 15th century, borrowed directly from middle french 'formidable', which itself derived from latin 'formidabilis'. this latin adjective is built on the noun 'formido', meaning 'fear, dread, or terror'. the underlying logic is direct: something that is 'formidabilis' has the inherent quality to inspire fear or awe. over time, the english meaning broadened from primarily 'causing dread' to also encompass the more positive sense of 'awe-inspiring' due to great size, strength, or difficulty, capturing the dual nature of something that is both intimidating and impressively powerful.

the word is a simplex loanword from latin, adopted as a whole into english. it is not productively formed from smaller, recognizable english morphemes.