"cavernously" meaning in English

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  "etymology_text": "Etymology tree\nEnglish cavernous\nMiddle English -ly\nEnglish -ly\nEnglish cavernously\nFrom cavernous + -ly.",
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          "text": "The lurid unearthly glow still hovered in the shadowy chamber, lighting ghostlily the dead face of Thugra Khotan, which seemed to grin mirthlessly and cavernously at them.",
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        "In a cavernous manner; like a cavern."
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        "In a cavernous manner; sounding deep, hollow, or echoey."
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          "deep"
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          "hollow",
          "hollow"
        ],
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          "echoey",
          "echoey"
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  "word": "cavernously"
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