"epä-" meaning in Finnish

{
  "etymology_templates": [
    {
      "args": {
        "1": "fi",
        "2": "urj-fin-pro",
        "3": "*epä"
      },
      "expansion": "Proto-Finnic *epä",
      "name": "inh"
    },
    {
      "args": {
        "1": "fi",
        "2": "-pä"
      },
      "expansion": "-pä",
      "name": "m"
    },
    {
      "args": {
        "1": "fi",
        "2": "ei"
      },
      "expansion": "ei",
      "name": "m"
    },
    {
      "args": {
        "1": "et",
        "2": "eba-"
      },
      "expansion": "Estonian eba-",
      "name": "cog"
    },
    {
      "args": {
        "1": "liv",
        "2": "äb"
      },
      "expansion": "Livonian äb",
      "name": "cog"
    },
    {
      "args": {
        "1": "mdf",
        "2": "аф"
      },
      "expansion": "Moksha аф (af)",
      "name": "cog"
    },
    {
      "args": {
        "1": "myv",
        "2": "апак"
      },
      "expansion": "Erzya апак (apak)",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Finnic *epä. Originally active present participle (-pä) of the negative verb stem *e-; see ei. Cognate with Estonian eba-, Livonian äb, Moksha аф (af), Erzya апак (apak).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "prefix",
        "head": ""
      },
      "expansion": "epä-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "epä-",
      "name": "fi-pref"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "epeli"
        }
      ],
      "examples": [
        {
          "text": "epä- + selvä (“clear”) → epäselvä (“unclear”)"
        }
      ],
      "glosses": [
        "Used to invert the meaning of a word: in-, non-, un-, dis-, mis-, mal-"
      ],
      "id": "en-epä--fi-prefix-tFOBVTXk",
      "links": [
        [
          "in-",
          "in-"
        ],
        [
          "non-",
          "non-"
        ],
        [
          "un-",
          "un-"
        ],
        [
          "dis-",
          "dis-"
        ],
        [
          "mis-",
          "mis-"
        ],
        [
          "mal-",
          "mal-"
        ]
      ],
      "related": [
        {
          "word": "evätä"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈepæ-/"
    },
    {
      "ipa": "[ˈe̞pæ-]"
    }
  ],
  "word": "epä-"
}

{
  "derived": [
    {
      "word": "epeli"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "fi",
        "2": "urj-fin-pro",
        "3": "*epä"
      },
      "expansion": "Proto-Finnic *epä",
      "name": "inh"
    },
    {
      "args": {
        "1": "fi",
        "2": "-pä"
      },
      "expansion": "-pä",
      "name": "m"
    },
    {
      "args": {
        "1": "fi",
        "2": "ei"
      },
      "expansion": "ei",
      "name": "m"
    },
    {
      "args": {
        "1": "et",
        "2": "eba-"
      },
      "expansion": "Estonian eba-",
      "name": "cog"
    },
    {
      "args": {
        "1": "liv",
        "2": "äb"
      },
      "expansion": "Livonian äb",
      "name": "cog"
    },
    {
      "args": {
        "1": "mdf",
        "2": "аф"
      },
      "expansion": "Moksha аф (af)",
      "name": "cog"
    },
    {
      "args": {
        "1": "myv",
        "2": "апак"
      },
      "expansion": "Erzya апак (apak)",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Finnic *epä. Originally active present participle (-pä) of the negative verb stem *e-; see ei. Cognate with Estonian eba-, Livonian äb, Moksha аф (af), Erzya апак (apak).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "prefix",
        "head": ""
      },
      "expansion": "epä-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "epä-",
      "name": "fi-pref"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "prefix",
  "related": [
    {
      "word": "evätä"
    }
  ],
  "senses": [
    {
      "categories": [
        "Finnish entries with incorrect language header",
        "Finnish lemmas",
        "Finnish prefixes",
        "Finnish terms derived from Proto-Finnic",
        "Finnish terms inherited from Proto-Finnic",
        "Finnish terms with IPA pronunciation"
      ],
      "examples": [
        {
          "text": "epä- + selvä (“clear”) → epäselvä (“unclear”)"
        }
      ],
      "glosses": [
        "Used to invert the meaning of a word: in-, non-, un-, dis-, mis-, mal-"
      ],
      "links": [
        [
          "in-",
          "in-"
        ],
        [
          "non-",
          "non-"
        ],
        [
          "un-",
          "un-"
        ],
        [
          "dis-",
          "dis-"
        ],
        [
          "mis-",
          "mis-"
        ],
        [
          "mal-",
          "mal-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈepæ-/"
    },
    {
      "ipa": "[ˈe̞pæ-]"
    }
  ],
  "word": "epä-"
}