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🔹 Adjective-to-Adjective Formations in -oso / -osa

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The suffix -oso/-osa is highly productive in Spanish, but almost always from nouns (peligro → peligroso) or verbs (gravar → gravoso). Genuine A-oso formations — adjective giving another adjective — are, according to the RAE itself, 'not numerous.' That's why this list is short on purpose: it's not that entries are missing, it's that hardly any more exist. In A-oso cases, the derived adjective usually adds a nuance of intensity, approximation, tendency, or characteristic behavior, rather than simply repeating the meaning of the base.

#	Derived Adjective	In English	Base Adjective	Base Adjective in English
1	grandioso / grandiosa	magnificent; grandiose; impressive	grande	big; great
2	verdoso / verdosa	greenish	verde	green
3	voluntarioso / voluntariosa	willing; eager; sometimes willful	voluntario	willing; voluntary
4	rotoso / rotosa	ragged; shabby (regional: Chile, Río de la Plata, Andes)	roto	torn; ragged
5	rancioso / ranciosa	rancid; stale (uncommon)	rancio	rancid; stale
6	habiloso / habilosa	skillful; clever (Bolivia, Chile, Ecuador)	hábil	skillful; able
7	molestoso / molestosa	annoying; troublesome (especially American Spanish)	molesto	annoying; bothersome
8	maloso / malosa	bad; nasty (regional/playful)	malo	bad
9	elegantoso / elegantosa	showily/affectedly elegant (colloquial/playful)	elegante	elegant
10	elegantioso / elegantiosa	showily elegant (Mexico and parts of the Andes)	elegante	elegant
11	intelectualoso / intelectualosa	overly/affectedly intellectual (playful/pejorative)	intelectual	intellectual

Important morphophonological details:

grande → grandioso uses the uncommon variant -ioso, the same one found in elegante → elegantioso; the RAE explicitly identifies both as A-oso formations.
verde → verdoso has an approximative meaning: it doesn't mean 'very green', but 'somewhat green, greenish'.
molestoso is morphologically ambiguous: it can be linked to the adjective molesto (A-oso) or the verb molestar (V-oso); the RAE mentions both analyses.
habiloso is used in Bolivia, Chile, and Ecuador.
rotoso is especially relevant in Chile and the Río de la Plata and Andean regions.
Don't confuse this class with the much larger N-oso group: peligro → peligroso, ruido → ruidoso, cariño → cariñoso, aceite → aceitoso, arena → arenoso, envidia → envidioso, talento → talentoso. Those are noun → adjective, not adjective → adjective.

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