quivering

vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze

• “a quaking bog”
• “the quaking child asked for more”
• “quivering leaves of a poplar tree”
• “with shaking knees”
• “seemed shaky on her feet”
• “sparkling light from the shivering crystals of the chandelier”
• “trembling hands”

a shaky motion

• “the shaking of his fingers as he lit his pipe”

the act of vibrating