"koustus" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Dérivations en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en breton suffixés avec -us",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Dérivé de koust, avec le suffixe -us."
  ],
  "forms": [
    {
      "form": "koustusocʼh",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "koustusañ",
      "tags": [
        "superlative"
      ]
    },
    {
      "form": "koustusat",
      "raw_tags": [
        "Exclamatif"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en breton",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Jules Gros, Le Trésor du Breton parlé - 2 : Dictionnaire breton-français des expressions figurées, 1re édition 1970, page 275",
          "text": "An traou-ze a zo koustuz.",
          "translation": "Ces choses-là sont coûteuses."
        }
      ],
      "glosses": [
        "Coûteux."
      ],
      "id": "fr-koustus-br-adj-kI6bsEJh"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈkus.tys\\"
    }
  ],
  "word": "koustus"
}

{
  "categories": [
    "Adjectifs en breton",
    "Dérivations en breton",
    "Mots en breton suffixés avec -us",
    "breton"
  ],
  "etymology_texts": [
    "Dérivé de koust, avec le suffixe -us."
  ],
  "forms": [
    {
      "form": "koustusocʼh",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "koustusañ",
      "tags": [
        "superlative"
      ]
    },
    {
      "form": "koustusat",
      "raw_tags": [
        "Exclamatif"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        "Exemples en breton"
      ],
      "examples": [
        {
          "ref": "Jules Gros, Le Trésor du Breton parlé - 2 : Dictionnaire breton-français des expressions figurées, 1re édition 1970, page 275",
          "text": "An traou-ze a zo koustuz.",
          "translation": "Ces choses-là sont coûteuses."
        }
      ],
      "glosses": [
        "Coûteux."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈkus.tys\\"
    }
  ],
  "word": "koustus"
}