"there's no knowing" meaning in English

{
  "etymology_text": ": there's no knowing < → δείτε τις λέξεις there's, no και knowing",
  "forms": [
    {
      "form": "there's no knowing"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ιδιωματισμοί (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "There’s no knowing what he will do.",
          "translation": "Δεν μπορεί να ξέρει κανείς τι θα κάνει."
        }
      ],
      "glosses": [
        "είναι αδύνατο να ξέρει κανείς"
      ],
      "id": "el-there's_no_knowing-en-phrase-~naJCH0x",
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "there's no knowing"
}

{
  "etymology_text": ": there's no knowing < → δείτε τις λέξεις there's, no και knowing",
  "forms": [
    {
      "form": "there's no knowing"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Ιδιωματισμοί (αγγλικά)"
      ],
      "examples": [
        {
          "text": "There’s no knowing what he will do.",
          "translation": "Δεν μπορεί να ξέρει κανείς τι θα κάνει."
        }
      ],
      "glosses": [
        "είναι αδύνατο να ξέρει κανείς"
      ],
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "there's no knowing"
}