Brazilian Portuguese Grammar

Adjective inflection Masculine singular adjectives ending in o form plural in os, feminine singular in a and feminine plural in as; Adjectives ending in e are masculine and feminine, and form plural in es; Adjectives ending in a are masculine and feminine, and form plural in as; The same rules apply to adjectives that refer to state capitals.
Masculine singular	Feminine singular	Masculine plural	Feminine plural
acreano or acriano	acreana or acriana	acreanos or acrianos	acreanas or acrianas
alagoano	alagoana	alagoanos	alagoanas
amapaense		amapaenses
amazonense		amazonenses
baiano	baiana	baianos	baianas
cearense		cearenses
espírito-santense		espírito-santenses
capixaba		capixabas
goiano	goiana	goianos	goianas
maranhense		maranhenses
mato-grossense		mato-grossenses
mato-grossense-do-sul		mato-grossenses-do-sul
mineiro	mineira	mineiros	mineiras
paraense		paraenses
paraibano	paraibana	paraibanos	paraibanas
paranaense		paranaenses
pernambucano	pernambucana	pernambucanos	pernambucanas
piauiense		piauienses
fluminense		fluminenses
rio-grandense-do-norte		rio-grandenses-do-norte
potiguar		potiguares
rio-grandense-do-sul		rio-grandenses-do-sul
gaúcho	gaúcha	gaúchos	gaúchas
rondoniense		rondonienses
roraimense		roraimenses
catarinense		catarinenses
paulista		paulistas
sergipano	sergipana	sergipanos	sergipanas
tocantinense		tocantinenses