The Spanish word 'enojado' (meaning 'angry') comes from the verb 'enojar' ('to anger'), which can be traced back to the Vulgar Latin word 'inodiare' meaning 'to cause hatred.' This Vulgar Latin term was formed by combining three elements: the prefix 'in-' (meaning 'in, into'), the root 'odium' (meaning 'hatred'), and the verbal suffix '-are'. The modern Spanish form 'enojado' includes the past participle suffix '-ado', making it function as both an adjective and past participle meaning 'angry' or 'angered.'

Some related Spanish words include the noun 'enojo' (meaning 'anger'), which is a more basic form derived from the same root. The verb 'enojar' is also commonly used in its reflexive form 'enojarse' (to get angry). These words all share the same etymological connection to the Latin concept of hatred or causing hatred, though in Spanish they've evolved to specifically refer to anger rather than hatred in general.

The English word 'odious' (meaning extremely unpleasant or repulsive) comes from the same Latin root 'odium' that gave us 'enojado'. While the Spanish word evolved to specifically mean 'angry', the English descendant maintained a meaning closer to the original Latin sense of hatred or something deserving hatred. Another related English word is 'annoy', which, though it might not look similar, also derives from the same Latin root and shows a similar semantic development from hatred to a milder form of irritation.