temper [ˈtempəʳ]
noun
1 (nature) carácter (m); genio (m); (mood) humor (m)
to be in a temper estar furioso; to be in a good/bad temper estar de buen/mal humor; to keep one's temper no perder la calma; contenerse; to lose one's temper perder los estribos; to have a quick temper tener genio; in a fit of temper en un acceso de furia or ira; to fly into a temper ponerse furioso; montar en cólera
mind your temper! temper, temper! ¡contrólate or controla ese genio!