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Pleasure, enjoyment, or fun derived from an activity or experience
この映画はとても楽しかった
This movie was very enjoyable
Often used as an adjective (楽しい) or noun (楽しみ) to describe enjoyable experiences
Ease or comfort, often in a physical or mental sense
この椅子は座るのが楽だ
This chair is comfortable to sit on
Can describe physical comfort or mental relaxation
The adjective form '楽しい' is more frequently used than the noun '楽' in modern Japanese.
Remember that '楽しい' is the adjective form, while '楽' is the noun form.
From Middle Chinese 'lɑk' meaning 'ease, comfort', related to the concept of physical and mental comfort
The kanji 楽 can be used as both a noun and an adjective. In modern Japanese, the adjective form 楽しい is more commonly used than the noun form 楽.