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S'énerver vs. se fâcher vs. se mettre en colère

The French verbs sénerver', se fâcher, and se mettre en colère all translate to getting angry or upset in English, but they carry different nuances. Getting the subtle differences right depends on the intensity of the emotion and whether the frustration is directed at a situation or an actual person. They range from mild nervous annoyance to intense, explosive rage.

S'énerver

B1
The verb sénerver' implies getting annoyed, irritated, or nervously agitated. It is mostly used when someone loses their patience over an annoying situation, a frustrating task, or a minor inconvenience, rather than feeling deep anger.
Il ne faut pas t'énerver pour si peu.
(You shouldn't get upset over so little.)
Elle s'énerve quand son ordinateur tombe en panne.
(She gets irritated when her computer breaks down.)
Je m'énerve facilement quand je conduis dans les embouteillages.
(I get annoyed easily when driving in traffic jams.)
Ne t'énerve pas, je vais tout t'expliquer depuis le début.
(Don't get agitated, I will explain everything to you from the beginning.)
Nous nous sommes énervés en essayant de monter ce meuble.
(We got frustrated trying to assemble this piece of furniture.)

Se fâcher

A2
The verb se fâcher means to get mad or cross, usually at someone. It is often used in an interpersonal context and can also mean to fall out with a person, implying that two people are currently sulking or have stopped talking to each other due to a disagreement.
Mon père va se fâcher si je rentre trop tard ce soir.
(My father will get angry if I come home too late tonight.)
Ils se sont fâchés après une longue dispute au sujet de l'argent.
(They fell out after a long argument about money.)
Je me suis fâché contre lui parce qu'il m'a menti plusieurs fois.
(I got mad at him because he lied to me several times.)
Ne te fâche pas, c'était juste une blague maladroite.
(Don't get mad, it was just a clumsy joke.)
Elle se fâche rarement avec ses collègues de travail.
(She rarely gets angry with her coworkers.)

Se mettre en colère

B1
The expression se mettre en colère literally translates to putting oneself in anger. It means to fly into a rage or have a massive outburst of anger. It is the strongest of the three terms and describes an intense, explicit, and visible emotional reaction to a serious trigger.
Le patron s'est mis en colère en voyant les résultats financiers de cette année.
(The boss flew into a rage upon seeing this year's financial results.)
Il est très rare de la voir se mettre en colère en public.
(It is very rare to see her lose her temper in public.)
Je me mets en colère quand je suis témoin d'une terrible injustice.
(I get furious when I witness a terrible injustice.)
Pourquoi te mets-tu en colère sans aucune raison valable ?
(Why are you getting angry for no valid reason?)
Nous nous sommes mis en colère face à cette décision purement arbitraire.
(We became furious in the face of this purely arbitrary decision.)

Summary

In short, use sénerver' to describe nervous impatience, frustration, and annoyance often triggered by objects or situations. Use se fâcher for interpersonal anger, getting mad at someone, or ending a relationship over a fight. Finally, reserve se mettre en colère for intense, visible outbursts of true rage and fury.