kuài

rapid

quick; speed; rate; soon; almost; to make haste; clever; sharp (of knives or wits); forthright; plainspoken; gratified; pleased; pleasant

heart (忄) + decisive cut (夬) = quick, sharp, and pleased

夬 depicts a decisive notch or cut — something that resolves tension swiftly. Pair that image with the heart radical and you get a mind that moves and feels without hesitation.

+
A decisive separationSemantic
HeartSemantic

Words with 快

周末愉快

zhōu mò yú kuài

have a nice weekend!

开快车

kāi kuài chē

to drive at high speed

灵快

líng kuài

agile

飞快

fēi kuài

very fast

松快

sōng kuai

less crowded

一吐为快

yī tǔ wéi kuài

to get sth off one's chest

不吐不快

bù tǔ bù kuài

to have to pour out what's on one's mind (idiom)

不快

bù kuài

unhappy

不愉快

bù yú kuài

disagreeable

乘龙快婿

chéng lóng kuài xù

ideal son-in-law

令人不快

lìng rén bù kuài

unpleasant

尽快

jǐn kuài

as quickly as possible; as soon as possible

More characters with 忄