"frustre" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en ancien français issus d’un mot en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "frustrement"
    }
  ],
  "etymology_texts": [
    "Du latin frustra (« en vain ») → voir fraus (« fraude »)."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "Vain, inutile."
      ],
      "id": "fr-frustre-fro-adj-zml1E08M"
    }
  ],
  "word": "frustre"
}

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en ancien français issus d’un mot en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du latin frustra (« en vain ») → voir fraus (« fraude »)."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "fruste"
    }
  ],
  "senses": [
    {
      "glosses": [
        "En vain, inutilement."
      ],
      "id": "fr-frustre-fro-adv-oqOpR2EI"
    }
  ],
  "word": "frustre"
}

{
  "categories": [
    "Adjectifs en ancien français",
    "Mots en ancien français issus d’un mot en latin",
    "ancien français"
  ],
  "derived": [
    {
      "word": "frustrement"
    }
  ],
  "etymology_texts": [
    "Du latin frustra (« en vain ») → voir fraus (« fraude »)."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "Vain, inutile."
      ]
    }
  ],
  "word": "frustre"
}

{
  "categories": [
    "Adverbes en ancien français",
    "Mots en ancien français issus d’un mot en latin",
    "ancien français"
  ],
  "etymology_texts": [
    "Du latin frustra (« en vain ») → voir fraus (« fraude »)."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "fruste"
    }
  ],
  "senses": [
    {
      "glosses": [
        "En vain, inutilement."
      ]
    }
  ],
  "word": "frustre"
}