You can use the adjective luxuriant to describe something really luxurious or full and lush. If you walk through a dense forest after it rains, it's really luxuriant with green plants overgrowing the paths.

Natural, growing things are luxuriant when they're fertile and full of life. People and places that show a fullness of life and wealth are also luxuriant. If you enter a room full of deep, plush couches and expensive decorations you're in a luxuriant space. And anything really enjoyable to the senses — whether costly or not — can be luxuriant, like a really rich and creamy piece of warm vanilla cake with a large hot chocolate: that's luxuriant.

Definitions of luxuriant

adj produced or growing in extreme abundance

exuberant, lush, profuse, riotous
present in great quantity

adj displaying luxury and furnishing gratification to the senses

epicurean, luxurious, sybaritic, voluptuary, voluptuous
characterized by or given to yielding to the wishes of someone

adj marked by complexity and richness of detail

elaborate, ornate
not plain; decorative or ornamented

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