The word "shakest" is an archaic term that means to shake or tremble. Some synonyms for this word include quiver, shiver, tremble, vibrate, oscillate, and judder. These words all describe a movement that is irregular or unsteady, often caused by physical or emotional stress. Some other synonyms for "shakest" include sway, waggle, and jiggle, which describe a more playful or jocular movement. Regardless of the context, the word "shakest" and its synonyms refer to a physical sensation that is felt in the body, whether due to fear, cold, excitement, or some other cause.