"síðast" meaning in Icelandic

{
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "síða(r)str"
      },
      "expansion": "Old Norse síða(r)str",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse síða(r)str, superlative for an adjective related to síð (“late”).",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "adjectives"
      },
      "expansion": "síðast",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "last"
      ],
      "id": "en-síðast-is-adj-NUfLESrE",
      "links": [
        [
          "last",
          "last"
        ]
      ]
    }
  ],
  "word": "síðast"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "síða(r)str"
      },
      "expansion": "Old Norse síða(r)str",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse síða(r)str, superlative for an adjective related to síð (“late”).",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "adjectives"
      },
      "expansion": "síðast",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Icelandic adjectives",
        "Icelandic entries with incorrect language header",
        "Icelandic lemmas",
        "Icelandic terms derived from Old Norse",
        "Icelandic terms inherited from Old Norse",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "last"
      ],
      "links": [
        [
          "last",
          "last"
        ]
      ]
    }
  ],
  "word": "síðast"
}