KanjiJLPT N1
Fervent

fervent, kind, cordial, serious, deliberate

Mnemonic

A horse charges through a dense bamboo grove with fervent devotion, snapping every stalk in its path. The horse's eyes blaze—each bamboo branch that lashes its body only deepens its wholehearted resolve. Fervent spirits cannot be broken.
Additional thoughts
Picture the horse's breath steaming as it crashes through bamboo—the crack of splitting stalks echoes its unyielding passion. Bamboo sitting atop horse in the kanji mirrors the weight of sincere devotion pressing forward no matter what.
Quick recall
A horse smashes through bamboo with fervent, unbreakable devotion.

Details

The keyword for 篤 is fervent. This kanji conveys a sense of deep sincerity, earnestness, and wholehearted devotion. It describes a quality of being genuinely passionate and steadfast in one's feelings, beliefs, or commitments. The character is also used in the context of serious illness, suggesting an intensity or gravity of condition, but its core meaning centers on warmth of spirit and devoted dedication.
On'yomi
とく
Kun'yomi
あつ.い