The Spanish word 'fastidiado' (meaning 'annoyed' or 'fed up') comes from the Latin word 'fastidium', which meant 'disgust' or 'annoyance'. This Latin word evolved into the Spanish noun 'fastidio' (annoyance), which was then turned into the verb 'fastidiar' (to annoy) by adding the verb suffix '-ar'. Finally, adding the past participle suffix '-ado' gives us 'fastidiado', meaning 'annoyed' or 'bothered'.

This etymology shows how Spanish preserved the core meaning of annoyance or disgust from Latin while developing different grammatical forms to express this concept.

A simpler and more common related Spanish word is 'fastidio', which is the noun form meaning 'annoyance' or 'nuisance'. You might also encounter the verb 'fastidiar', meaning 'to annoy' or 'to bother'. These words share the same Latin root and are part of the same word family, making them easier to remember together.

While English doesn't have any common direct cognates from Latin 'fastidium', we do have some more formal or technical words that share this root, such as 'fastidious' (meaning paying careful attention to detail, sometimes to the point of being annoying). The connection becomes clearer when you consider that someone who is fastidious might cause annoyance ('fastidio') to others with their excessive attention to detail.