trembling

(noun) a shaky motion. Synonyms: shaking, shakiness, quiver, quivering, vibration, palpitation. Example: "The shaking of his fingers as he lit his pipe."

(verb) move or jerk quickly and involuntarily up and down or sideways. Synonyms: tremble. Example: "His hands were trembling when he signed the document."

(adj) vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze. Synonyms: shaky, shivering. Examples: "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."