convulsively

estremecerse convulsivamente

to shake uncontrollably for a moment, for example because you are frightened or disgusted

Temblar de una manera violenta e incontrolada.

moverse convulsivamente

to move with a sudden, sharp, uncontrolled motion

Moverse con sacudidas violentas e incontrolables.

contraerse convulsivamente

to make a sudden, small, uncontrolled movement, especially of a part of your body

contraerse de forma violenta e incontrolada

tragar convulsivamente

to make a swallowing motion with a series of muscle spasms, often due to distress or difficulty

Tragar de manera repentina, violenta e incontrolada, a menudo mientras se llora o se tiene miedo.