ineptness vs clumsiness

ineptness and clumsiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ineptness	Yes	No	No	No
clumsiness	Yes	No	No	No

As nouns, ineptness and clumsiness are synonyms defined as:

ineptness and clumsiness: unskillfulness resulting from a lack of training

Other synonyms of ineptness include awkwardness, ineptitude, maladroitness, slowness.

ineptness (noun)	clumsiness (noun)
the quality of having the wrong properties for a specific purpose	the carriage of someone whose movements and posture are ungainly or inelegant
unskillfulness resulting from a lack of training	the inelegance of someone stiff and unrelaxed (as by embarrassment)
	unskillfulness resulting from a lack of training