The Spanish verb 'enojar' (meaning 'to anger' or 'to make angry') comes from the Vulgar Latin word 'inodiare', which also meant 'to anger'. The Latin word was formed by combining three parts: the prefix 'in-' meaning 'into', the root 'odium' meaning 'hatred', and the verb suffix '-are'. So literally, it meant something like 'to put into hatred' or 'to make hateful', which evolved to mean 'to make angry' in modern Spanish. The change from 'inodiare' to 'enojar' followed regular sound changes as the word evolved from Latin to Spanish.

A common related Spanish word is 'enojo' (the noun form meaning 'anger'), which is directly derived from 'enojar'. You might also encounter 'enojado' (meaning 'angry'), which is the past participle of 'enojar'. These words form a family that all relate to the concept of anger and annoyance in Spanish.

The English word 'odious' (meaning 'hateful' or 'extremely unpleasant') comes from the same Latin root 'odium' that gave us 'enojar'. Another related English word is 'annoy', which, while it came through a different path, ultimately derives from the same Latin concept of creating a feeling of dislike or hatred. This connection helps explain why 'enojar' can sometimes mean 'to annoy' in addition to its primary meaning of 'to anger'.