suddenly

to realize or notice something unexpectedly

to experience a quick onset of fear

to become scared in an instant

to be surprised or shocked unexpectedly

de repente alerta

to become watchful and attentive unexpectedly

volverse vigilante y atento inesperadamente

de repente cauteloso

to become cautious or suspicious unexpectedly

Volverse abruptamente cauteloso.

to cease an action or movement without warning

to start without warning

darse cuenta de repente

to become aware of something unexpectedly

tomar conciencia de algo inesperadamente

aparecer de repente

to come into sight unexpectedly

aparecer inesperadamente a la vista

recordar de repente

to recall a memory without warning

recordar un recuerdo sin previo aviso

desaparecer de repente

to vanish from sight unexpectedly

desvanecerse de la vista inesperadamente

desvanecerse de repente

to disappear from sight quickly and mysteriously

desaparecer de la vista rápida y misteriosamente