The Spanish word 'intrepidez' (meaning 'intrepidity' or 'fearlessness') comes from combining the Spanish adjective 'intrépido' ('intrepid') with the suffix '-ez', which is used to form abstract nouns from adjectives. 'Intrépido' itself comes from the Latin word 'intrepidus' meaning 'fearless', which was formed from the prefix 'in-' (meaning 'not') and 'trepidus' (meaning 'trembling'). So literally, the word was built from components meaning 'not trembling', which evolved to mean 'fearless' or 'brave'.

A related Spanish word is 'trépido', though it's less common than 'intrépido'. The word 'trepidación' (meaning 'trepidation' or 'trembling') is also related, coming from the same Latin root 'trepidus'. These words maintain the connection to the original meaning of trembling or fearful movement.

English speakers might recognize the connection to words like 'intrepid' and 'trepidation'. 'Intrepid' in English has the same meaning as Spanish 'intrépido', meaning 'fearless' or 'brave'. 'Trepidation' means 'fear' or 'trembling', preserving the meaning of the original Latin 'trepidus'. Understanding these English cognates can help remember that 'intrepidez' refers to the quality of being fearless or brave.