Zi:快

快 [kuài] happy (快​乐, ​愉快); fast/quick; sharp; (HDZ:) ​高​兴, ​愉快; …; ​迅​速 …; (​姓)

3 monosyllabic entries in The ABC Cantonese-English Dictionary (namespace Jyut):

►faai1 ​快 b.f./char. ►faai1 baa2 快把
►faai3 ​快 b.f./char. ►daai6 faai3 wut6 大快活 ►dau3 faai3 鬥快 ►duk6 ban2 faai3 caan1 ce1 毒品快餐車 ►faai3 caan1 jat1 zuk6 快餐一族
►faai3/1 ​快 b.f./char. ►faai3/1 lou2 快佬 ►faai3/1 lou4/2 快勞 ►hoi1 faai3/1 lou2 開快佬

One monosyllabic entry in The ABC Chinese-English Comprehensive Dictionary (namespace Ci):

►¹kuài* ​快 {A} s.v./adv. ①fast; quick ‖ ∼ zǒu a, yào chídào le. ∼走啊, 要迟到了。 Hurry up, we're late. ②soon ③quick-witted; ingenious ④sharp (of knives) ⑤straightforward ⑥pleased; elated

The Shuōwén Seal form of 快(​􁲑​𢘦) kuài ‘happy’ combines ​忄(​心 xīn) ‘heart/feeling’, and ​夬(​􀠚​叏) guài (phonosemantic).
    Compare: ​筷 kuài ‘chopsticks’, formerly wr. 快; ​块/​塊(​􂘹) kuài ‘chunk’, ​决 jué ‘decide’.
    Note: 快 kuài ‘fast/quick’, formerly wr. ​𫘝/​駃(​􁪑).
    HDZ: 快 : kuài : ​高​兴, ​愉快; ​畅快, ​舒​畅; ​秤​心, ​遂​意; ​直​爽, ​爽快 (​心​直​口快, 快​人快​语); ​锋​利; ​放​纵; ​好; ​迅​速 (​跑​得快, ​进​步快) (cf. ​駃); ​会, ​能; (​旧) (​捕快, ​马快); (​旧) (​叉快); (​副​词) 快​要, ​将​要 (​天快​亮​了, 快​竣​工​了); ​筷; ​一; (​姓)
►references: Guǎngyùn:386.36; Karlgren:AD440,GSR312k; Hànyǔ Dà Zìdiǎn:4.2278.11; Mathews:3547; Kāngxī Zìdiǎn:377.29; Bǐshùn Guīfàn:061.0.04; EDOC:1
►components: ​忄​夬​​​​大​人​八
►Cantonese: faai-
Shuōwén: ​􁲑(​𢘦)
►stroke 快 (... strokes)   
►list characters containing 快 as a component
►list words containing 快 (most common words first)
Unicode: U+5FEB
►web links for ‘快’
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