adjective
languorous
LANG-ger-uhs/ˈlæŋɡərəs/
Pleasantly relaxed and lacking energy.
The languorous man rests comfortably in the hammock with a faint smile.

Etymology
The adjective characterizes someone or something as having languor. Earlier associations with illness and suffering gave way to weariness and low energy, often with a seductive quality that fits the pleasantly relaxed sense.
In context
that thin, languorous figure, dressed like a rich person, lounging like one, beautiful, mysterious, alluring. Her bare arms were clasped behind her head
More examples
- We spend a languorous afternoon lounging beside the pool.
- His languorous movements match the lazy rhythm of the music.
- After the massage, I feel languorous and content.
Forms
languor noun — A pleasant feeling of dreamy tiredness.
languorously adverb — In a pleasantly relaxed, unhurried way.