🔹 Deadjectival Nouns Ending in -itud

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The suffix -itud forms feminine abstract nouns expressing quality, state, or property from an adjectival base: exacto (exact) → exactitud (exactness), amplio (broad) → amplitud (breadth), lento (slow) → lentitud (slowness). Most are learned words inherited or adapted from Latin, which makes -itud far less productive in modern Spanish than -idad — even so, the RAE analyzes them in relation to their corresponding Spanish adjectives.

#	Spanish Noun	Noun in English	Base Adjective	Base Adjective in English
1	longitud	length	longo / luengo *	long
2	exactitud	exactness; accuracy	exacto	exact; accurate
3	latitud	latitude	lato	broad; wide
4	similitud	similarity; resemblance	símil	similar
5	esclavitud	slavery; enslavement	esclavo	enslaved; slave
6	aptitud	aptitude; ability; suitability	apto	suitable; capable
7	gratitud	gratitude	grato	pleasant; agreeable
8	amplitud	breadth; width; scope	amplio	broad; wide
9	altitud	altitude; height	alto	high
10	lentitud	slowness	lento	slow
11	magnitud	magnitude; size	magno	great; large
12	plenitud	fullness; completeness	pleno	full
13	rectitud	uprightness; integrity; straightness	recto	upright; straight
14	ineptitud	ineptitude; incompetence	inepto	inept; incompetent
15	inexactitud	inaccuracy; inexactness	inexacto	inaccurate; inexact
16	finitud	finitude; finiteness	finito	finite
17	verosimilitud	plausibility; verisimilitude	verosímil	plausible; credible
18	prontitud	promptness; speed	pronto	prompt; quick
19	laxitud	laxity; looseness	laxo	lax; loose
20	pulcritud	neatness; cleanliness; meticulousness	pulcro	neat; clean
21	negritud	Black identity/culture; blackness	negro	black
22	completitud	completeness	completo	complete
23	acritud	acrimony; harshness	acre	acrid; harsh
24	beatitud	beatitude; blessedness	beato	blessed; devout
25	excelsitud	loftiness; excellence	excelso	exalted; sublime
26	solitud	solitude (literary)	solo	alone; solitary
27	certitud	certainty (rare)	cierto	certain

Variants -ud / -tud

The RAE treats -ud and -tud as variants of the same suffix, but for clarity we show them separately.

#	Spanish Noun	Noun in English	Base Adjective	Base Adjective in English
1	quietud	stillness; quiet	quieto	quiet; still
2	inquietud	uneasiness; concern	inquieto	uneasy; restless
3	decrepitud	decrepitude	decrépito	decrepit
4	solicitud	solicitude; attentiveness	solícito	solicitous; attentive
5	juventud	youth	joven	young

Important morphophonological details:

amplio → amplitud: the -io ending is dropped before -itud.
exacto → exactitud, lento → lentitud, pleno → plenitud: the adjective's final vowel disappears.
verosímil → verosimilitud: the adjective loses its written accent because stress shifts in the derived word.
longitud is a special historical case: it relates to the old Spanish longo/luengo ('long'); the link to a modern adjectival base has largely disappeared.
certitud is very rarely used; certeza and certidumbre are used instead.
solitud carries markedly literary/poetic connotations, unlike soledad.
negritud rarely means literal 'blackness'; it mainly designates a set of cultural traits.
Words like actitud, multitud, or vicisitud are excluded from this chart because in modern Spanish they don't have a synchronically identifiable adjectival base.

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