The kanji 愉 primarily conveys the meaning of "joy," "pleasure," or "delight." It represents a state of happiness and contentment.

・On-yomi (音読み): Yu (ユ) ・Kun-yomi (訓読み): たの（しい） (tanoshī) - happy, enjoyable

⚫︎ 愉快（ゆかい） Translation: pleasant; delightful; enjoyable ⚫︎ 愉しい（たのしい） Translation: fun; enjoyable; happy ⚫︎ 愉悦（ゆえつ） Translation: pleasure; delight; joy

The kanji 愉 is a phono-semantic compound (形声文字). It is composed of the semantic component of the heart radical (忄, ⺗, or りっしんべん), which indicates emotion, and the phonetic component of 余 (yo), which suggests the sound and adds the meaning of "extra" or "remaining". Therefore, the character suggests a feeling of happiness or joy that is "extra" or "remaining" in one's heart.