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