rough, clumsy, violent
悍 centers on a rough, forceful, and uncontrolled quality: something clumsy, violent, or wild in manner.
悍 combines the heart radical 忄 with 旱, which likely contributes the sound and may suggest dryness or harshness, together conveying a rough or violent temperament.
The heart radical 忄 beside 旱 (dry, drought) suggests a heart that is parched and harsh, leading to rough, clumsy, and violent behavior.
For カン, imagine a rough, violent person swinging a can: can -> カン, and their clumsy actions knock things over.
virile; tough; masculine; sharp (features, look, etc.); fierce; dauntless
heinousness; ferocity
fierce; daring; savage; intrepid
as fierce and nimble as any; daring and agile without equal
strong and fierce
bad-tempered woman; shrew; vixen; virago
unruly horse; unmanageable horse; unbroken horse