When someone looks or acts lustfully, they show strong sexual wanting. It is about the body and desire, not about being happy or full of life. You meet this word more in writing than in everyday talk — in stories, in news, or in rather old-fashioned descriptions. It is not a kind or polite word. It often suggests a look or a manner that makes other people uncomfortable. The old English adverb behind it once meant something closer to “gladly” or “with a full heart,” but that meaning has gone. Today it is almost always about sexual desire. Do not mix it with lustily, which is about energy and health.

充滿情慾地；色迷迷地