Reduplication

Tengthah-suu (重疊辭 ;  reduplication )

koaan, koankoaan, koaarn'koankoaan

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