ineptness vs ineptitude

ineptness and ineptitude both are nouns.

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

As nouns, ineptness and ineptitude are synonyms defined as:

ineptness and ineptitude: unskillfulness resulting from a lack of training

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

ineptness (noun)	ineptitude (noun)
the quality of having the wrong properties for a specific purpose	having no qualities that would render it valuable or useful
unskillfulness resulting from a lack of training	unskillfulness resulting from a lack of training