"not worth a curse" meaning in English

{
  "etymology_text": "Corrupted from earlier not worth a cress.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "not worth a curse (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1908, W[illiam] B[lair] M[orton] Ferguson, chapter IV, in Zollenstein, New York, N.Y.: D. Appleton & Company, →OCLC, page 41:",
          "text": "“My Continental prominence is improving,” I commented dryly. ¶ Von Lindowe cut at a furze bush with his silver-mounted rattan. ¶ “Quite so,” he said as dryly, his hand at his mustache. “I may say if your intentions were known your life would not be worth a curse.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Worthless."
      ],
      "id": "en-not_worth_a_curse-en-adj-t-Q6PBDo",
      "links": [
        [
          "Worthless",
          "worthless"
        ]
      ],
      "synonyms": [
        {
          "word": "worthless"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "not worth a curse"
}

{
  "etymology_text": "Corrupted from earlier not worth a cress.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "not worth a curse (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1908, W[illiam] B[lair] M[orton] Ferguson, chapter IV, in Zollenstein, New York, N.Y.: D. Appleton & Company, →OCLC, page 41:",
          "text": "“My Continental prominence is improving,” I commented dryly. ¶ Von Lindowe cut at a furze bush with his silver-mounted rattan. ¶ “Quite so,” he said as dryly, his hand at his mustache. “I may say if your intentions were known your life would not be worth a curse.”",
          "type": "quote"
        }
      ],
      "glosses": [
        "Worthless."
      ],
      "links": [
        [
          "Worthless",
          "worthless"
        ]
      ],
      "synonyms": [
        {
          "word": "worthless"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "not worth a curse"
}