ineptitude vs slowness

ineptitude and slowness both are nouns.

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

As nouns, ineptitude and slowness are synonyms defined as:

ineptitude and slowness: unskillfulness resulting from a lack of training

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

ineptitude (noun)	slowness (noun)
having no qualities that would render it valuable or useful	a rate demonstrating an absence of haste or hurry
unskillfulness resulting from a lack of training	lack of normal development of intellectual capacities
	unskillfulness resulting from a lack of training