bulky \ˈbəlkē, ˈbu̇l-, -ki\adjective (-er/-est) 1. a.: having bulk; especially: large of its kind < a bulky volume > b.: stout, corpulent — used of the human body 2.: occupying overmuch space : clumsy, unwieldy < a bulky ill-packed load > especially: having great bulk in proportion to weight < a pound of feathers is bulkier than a pound of lead > 3.of explosives: having considerable bulk in proportion to disruptive power Synonyms:see massive