WordNet sense 1 (showing lack of skill or aptitude):

clumsy, incompetent, fumbling

WordNet sense 2 (not having or showing or requiring special skill or proficiency):

unskilled

WordNet sense 3 (lacking physical movement skills, especially with the hands):

bumbling, butterfingered, ham-fisted, ham-handed, heavy-handed, left-handed, handless

WordNet sense 4 (not adroit):

maladroit