愉快 （ユカイ） pleasant, delightful, enjoyable, joyful, cheerful, amusing, happy

愉悦 （ユエツ） joy, pleasure, delight

楽しい （たのしい） enjoyable, fun, pleasant, happy, delightful

楽しむ （たのしむ） to enjoy, to take pleasure in, to have a good time, to have fun, to look forward to