fortitude
FOR-ti-tood · noun
Origin
From Middle English fortitude, borrowed via Old French from Latin fortitūdō, meaning 'bravery, strength,' itself from fortis, 'brave, strong.'
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Journey
The word has carried its core sense of strength and bravery from Latin through French into English largely intact.
Related words
It shares its root with fortis, the Latin word for 'strong,' which underlies other English words built on the idea of strength and force.