Lack of skill is a term used to describe the INABILITY to perform a task or job due to a lack of knowledge, experience, or aptitude. INABILITY (9 letters) is defined as the lack of ability or power to do something. INCOMPETENCE (12 letters) is the lack of the necessary skills or knowledge to do something properly. INEPTNESS (9 letters) is the quality of being unskilled or inadequate. INEPTITUDE (10 letters) is the state of being inept or unable to do something. All of these terms refer to a lack of skill in some capacity.