"immurgu" meaning in Old Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "immorro"
          },
          "expansion": "Middle Irish: immorro, immurgu\nIrish: iomorra",
          "name": "desctree"
        }
      ],
      "text": "Middle Irish: immorro, immurgu\nIrish: iomorra"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "imm-",
        "pos": "intensive prefix"
      },
      "expansion": "imm- (intensive prefix)",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ro-",
        "t": "very"
      },
      "expansion": "ro- (“very”)",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "gáu",
        "t": "untruth"
      },
      "expansion": "gáu (“untruth”)",
      "name": "m"
    }
  ],
  "etymology_text": "Thurneysen suggests it may be from imm- (intensive prefix) + ro- (“very”) + gáu (“untruth”), which seems unlikely both formally and semantically.",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb",
        "3": "never the first word in its clause"
      },
      "expansion": "immurgu (never the first word in its clause)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "camaiph immurgu"
        }
      ],
      "glosses": [
        "however, nevertheless"
      ],
      "head_nr": 1,
      "id": "en-immurgu-sga-adv-3ZwMchZd",
      "links": [
        [
          "however",
          "however"
        ],
        [
          "nevertheless",
          "nevertheless"
        ]
      ],
      "synonyms": [
        {
          "word": "cammaiph"
        },
        {
          "word": "immargu"
        },
        {
          "word": "imurgu"
        },
        {
          "word": "im̅"
        },
        {
          "tags": [
            "abbreviation"
          ],
          "word": "im̅r"
        }
      ],
      "wikipedia": [
        "D. A. Binchy",
        "Osborn Bergin"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/iˈmurɣu/"
    }
  ],
  "word": "immurgu"
}

{
  "derived": [
    {
      "word": "camaiph immurgu"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "immorro"
          },
          "expansion": "Middle Irish: immorro, immurgu\nIrish: iomorra",
          "name": "desctree"
        }
      ],
      "text": "Middle Irish: immorro, immurgu\nIrish: iomorra"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "imm-",
        "pos": "intensive prefix"
      },
      "expansion": "imm- (intensive prefix)",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ro-",
        "t": "very"
      },
      "expansion": "ro- (“very”)",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "gáu",
        "t": "untruth"
      },
      "expansion": "gáu (“untruth”)",
      "name": "m"
    }
  ],
  "etymology_text": "Thurneysen suggests it may be from imm- (intensive prefix) + ro- (“very”) + gáu (“untruth”), which seems unlikely both formally and semantically.",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb",
        "3": "never the first word in its clause"
      },
      "expansion": "immurgu (never the first word in its clause)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Old Irish adverbs",
        "Old Irish entries with incorrect language header",
        "Old Irish lemmas",
        "Old Irish terms with IPA pronunciation"
      ],
      "glosses": [
        "however, nevertheless"
      ],
      "head_nr": 1,
      "links": [
        [
          "however",
          "however"
        ],
        [
          "nevertheless",
          "nevertheless"
        ]
      ],
      "wikipedia": [
        "D. A. Binchy",
        "Osborn Bergin"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/iˈmurɣu/"
    }
  ],
  "synonyms": [
    {
      "word": "cammaiph"
    },
    {
      "word": "immargu"
    },
    {
      "word": "imurgu"
    },
    {
      "word": "im̅"
    },
    {
      "tags": [
        "abbreviation"
      ],
      "word": "im̅r"
    }
  ],
  "word": "immurgu"
}