sudden

happening or arriving unexpectedly and quickly, often causing surprise

repentino, inesperado

• a sudden change/attack/disease
• be a sudden shock

Collocations sudden attack · sudden decision

• There was a sudden knock at the door.

  Hubo un golpe repentino en la puerta.

happening or arriving very quickly, without warning and often unexpectedly

de repente, de pronto

• suddenly (adv) + V

Collocations suddenly appear · suddenly disappear

• Suddenly, the sky turned dark.

  De repente, el cielo se oscureció.

happening unexpectedly and often interrupting something else that is happening or planned

inopinado, inesperado

• a sudden interruption/stop

Collocations sudden interruption · sudden stop

• The meeting was interrupted by a sudden announcement.

  La reunión fue interrumpida por un anuncio inesperado.

to do something suddenly and unexpectedly, often causing surprise or shock

hacer de repente, actuar sin previo aviso

• V (suddenly)

• He suddenly left the room.

  Él salió de repente del cuarto.