耽
タン, ふ.ける
addicted, absorbed in
JLPT0 G13 S0 F5000
As per
冘
# as described in
沈
(sink) +
耳
ear → drooping ears → *indulgence* (← droopiness) → *be absorbed in*. Compare
甚
and
淫
.
[Full Kanji Etymology List]