"duller" meaning in English

{
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  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "dull",
        "3": "er",
        "id2": "agent noun",
        "pos1": "verb"
      },
      "expansion": "dull (verb) + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "dull (verb) + -er",
  "forms": [
    {
      "form": "dullers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "duller (plural dullers)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "6 94",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "tooth duller"
        }
      ],
      "glosses": [
        "One who, or that which, dulls."
      ],
      "id": "en-duller-en-noun-9bb-5aDd"
    }
  ],
  "word": "duller"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "dull",
        "3": "er",
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        "pos1": "adjective"
      },
      "expansion": "dull (adjective) + -er",
      "name": "suf"
    }
  ],
  "etymology_text": "dull (adjective) + -er",
  "head_templates": [
    {
      "args": {
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        "2": "comparative adjective"
      },
      "expansion": "duller",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "63 37",
          "kind": "other",
          "name": "English terms suffixed with -er (comparative)",
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      ],
      "form_of": [
        {
          "extra": "more dull",
          "word": "dull"
        }
      ],
      "glosses": [
        "comparative form of dull: more dull"
      ],
      "id": "en-duller-en-adj-~bZyEJDy",
      "links": [
        [
          "dull",
          "dull#English"
        ]
      ],
      "tags": [
        "comparative",
        "form-of"
      ]
    }
  ],
  "word": "duller"
}

{
  "categories": [
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    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English non-lemma forms",
    "English nouns",
    "English terms suffixed with -er (agent noun)",
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  ],
  "derived": [
    {
      "word": "tooth duller"
    }
  ],
  "etymology_number": 1,
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      "args": {
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        "2": "dull",
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      "expansion": "dull (verb) + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "dull (verb) + -er",
  "forms": [
    {
      "form": "dullers",
      "tags": [
        "plural"
      ]
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "One who, or that which, dulls."
      ]
    }
  ],
  "word": "duller"
}

{
  "categories": [
    "English comparative adjectives",
    "English entries with incorrect language header",
    "English non-lemma forms",
    "English terms suffixed with -er (comparative)"
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  "etymology_number": 2,
  "etymology_templates": [
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      "expansion": "dull (adjective) + -er",
      "name": "suf"
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  ],
  "etymology_text": "dull (adjective) + -er",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
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        "English comparative adjectives"
      ],
      "form_of": [
        {
          "extra": "more dull",
          "word": "dull"
        }
      ],
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        "comparative form of dull: more dull"
      ],
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          "dull",
          "dull#English"
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  "word": "duller"
}