Reduplication

jiirn'jinjiin (仁仁仁 ; extremely jiin - firm & full )

Duples (A'A)

You can repeat monosyllable A to get A'A, for some emphasis, to mean "quite" or "very".

loaxnloan (亂亂 ; q. disorderly; chaotic )
hoanhoafn (番番 ; q. uncivilized; rude; unreasonable )
koankoaan (懸懸 ; q. high; tall; elevated )
oarn'oaxn (怨怨 ; q. loathed; hated )
boafnboarn (滿滿 ; q. full of; brimming with )
thoatthoad (脫脫 ; q. separated; broken away from )
boadboat (沫沫 ; q. foamy; sudsy )

Triplication

You can repeat a syllable A three times (A"A'A) to mean extremely A. Generally, the first syllable undergoes tone change to the rare rising tone (#6; see Tones of Taiwanese). (Note that different rules are currently found at Taiwanese Hokkien#In_triplicated_adjectives)

loaan'loaxnloan (亂亂亂 ; x. disorderly; chaotic )
hoaarn'hoanhoafn (番番番 ; x. uncivilized; rude; unreasonable )
koaarn'koankoaan (懸懸懸 ; x. high; tall, etc )
oaafn'oarn'oaxn (怨怨怨 ; x. loathed; hated )
boaarn'boafnboarn (滿滿滿 ; x. full of; brimming with )
thoaat'thoatthoad (脫脫脫 ; x. separated; broken away from )
boaat'boadboat (沫沫沫 ; x. foamy; sudsy )

Køq khvoax

lau-khokkhog, etc (Online Abbreviations)
khuikhuy (開開 ; (adj) opened )
khuy`khuy (開開 ; to open )
khiuxkhiu (𩚨𩚨 ; quite khiu - chewy; rubbery )
niaxnia (爾爾 ; only; that is all (gives finality to a clause) )

Zhamkhør

http://www.edutech.org.tw/Composition.htm