Lacking coordination, skill, or grace in movement or action. His clumsy attempt to catch the ball resulted in it bouncing off his hands.
Awkwardly or ineptly done or made. The clumsy design of the website made it difficult to navigate.
Lacking social grace or tact. Her clumsy comment about his appearance made everyone uncomfortable.
Large, heavy, or badly shaped so as to be difficult to use or handle; unwieldy. He struggled with the clumsy suitcase up the narrow stairs.