憂
ユウ, うれ.える, うれ.い, う.い, う.き, ゆ

melancholy, grieve, lament, be anxious, sad, unhappy

JLPT1 G7 S15 F1625

The relevant seal inscription form is an element combining 頁 head and 心 heart/emotions + 夊 here an abbreviated form# of 後 (drag along) → pensive, dragging state of mind, causing deliberate movement (compare 愛) → *sadness*; *anxiety*; *worry*; *grief*; *disappointment*; *depression*.

[Full Kanji Etymology List]