En colère vs. fâché vs. furieux vs. énervé

The French language has a rich vocabulary to express varying degrees of anger. Understanding the nuances between 'en colère', 'fâché', 'furieux', and 'énervé' can be helpful in grasping the extent of someone's irritation or rage. These words, although similar, depict different intensities and causes of the emotion.

En colère

Expresses a general state of being angry or upset. It is more formal than 'fâché' and can range from moderately to very upset, depending on context.
Il est en colère contre son employé qui est arrivé en retard.
(He is angry at his employee who arrived late.)
La professeure était vraiment en colère après avoir vu la triche.
(The teacher was really angry after seeing the cheating.)

Fâché

Denotes a milder form of anger, akin to 'upset' or 'mad'. It can be used in casual situations and often implies a personal sense of anger.
Je suis fâché que tu n'aies pas fait la vaisselle.
(I am upset that you didn't do the dishes.)
Ne sois pas fâché, j'ai oublié ton anniversaire par accident.
(Don't be mad, I accidentally forgot your birthday.)

Furieux

Indicates an extreme level of anger, equivalent to 'furious' or 'livid'. This word conveys a stronger emotion than 'en colère' and is often used to describe rage.
Il était furieux quand il a découvert la vérité.
(He was furious when he found out the truth.)
La tempête s'est abattue avec une force furieuse, déracinant les arbres.
(The storm struck with furious force, uprooting trees.)

Énervé

Refers to a state of being annoyed or irritated rather than outright angry. It suggests a level of agitation or frustration more so than deep anger.
Je suis énervé parce que le bruit de la construction m'empêche de travailler.
(I am annoyed because the construction noise is preventing me from working.)
Elle était énervée par le comportement bruyant des enfants dans le restaurant.
(She was irritated by the children's noisy behavior in the restaurant.)

Summary

In summary, these four French words depict different intensities of anger: 'en colère' can indicate a serious level of anger but is generally less intense than 'furieux' which expresses extreme anger or rage; 'fâché' refers to being upset or mad on a personal level and tends to be less intense than 'en colère'; while 'énervé' conveys annoyance or irritation without reaching the threshold of profound anger depicted by the other terms. Each term is useful for effectively communicating various degrees of discontent or aggravation in different scenarios.