adjective
having one's attention fully absorbed by something; fascinated
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She was so engrossed in the novel that she didn't hear the doorbell ring.
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I was completely engrossed in that movie, I didn't even notice you come in.
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I was totally engrossed in that game, I didn't realize how much time had passed.
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His mind was engrossed in thoughts of the future, unable to focus on the present moment.