Another word for lack of skill?

Here are some words for "lack of skill," depending on the context:

General terms:

* Incompetence

* Ineptness

* Clumsiness

* Unskillfulness

* Unpreparedness

* Inexperience

* Amateurism

* Unfamiliarity

* Lack of proficiency

* Lack of expertise

More specific terms:

* Awkwardness (for physical skills)

* Blundering (for mistakes)

* Fumbling (for handling objects)

* Inefficiency (for work)

* Ignorance (for knowledge)

* Untidiness (for organization)

Figurative terms:

* Greenhorn (for someone new to something)

* Rookie (for someone new to something)

* Lacks the knack (for a particular ability)

* All thumbs (for someone clumsy)

The best word will depend on the specific situation and the nuance you want to convey.