regret, bear a grudge, resentment, malice, hatred
恨 centers on a deep, lingering negative feeling toward someone or something: resentment, bearing a grudge, or hatred. Regret is a related inward-turning form of this same bitter emotion.
恨 combines 忄 (heart) with 艮, which likely contributes the sound and may carry a sense of stopping or being fixed, suggesting a feeling that stays in the heart.
The heart radical 忄 beside 艮 (which looks like a person rooted in place) suggests a feeling that won't move: resentment or a grudge stuck in the heart.
For コン, imagine a con artist who holds a grudge after being caught: con -> コン, and the resentment stays in their heart.
resentment; grudge; malice; bitterness
to bear a grudge against; to resent; to blame; to curse; to feel bitter towards
being resented (by someone one holds resentment towards)
deep regret; great sorrow; bitter grief
grudge; ill will; enmity
enmity; grudge
regret; remorse; repentance; contrition
reproachful; hateful; bitter
grudge; complaint; reproach
pent-up resentment; grudges and hard feelings
many regrets; much sadness; much resentment; much bitterness
sensibility; (having) many worries and regrets
old grudge; old score
reproachful; resentful; spiteful
hard feelings; (mutual) resentment
with no hard feelings
to avenge oneself
to incur someone's enmity
song with lyrics about resentment and a sorrowful tune
to have a deep grudge; to bear deep resentment towards someone