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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery :not() official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    label { display: block; margin: 10px 0; }
    span { padding: 2px 8px; border-radius: 4px; }
  </style>
</head>
<body>
  <form>
    <label><input type="checkbox" checked> <span>Mary</span></label>
    <label><input type="checkbox"> <span>lcm</span></label>
    <label><input type="checkbox" checked> <span>Peter</span></label>
  </form>
  <p><small>Inputs are disabled so you cannot toggle — highlights show unchecked state only.</small></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("input:not(:checked) + span").css("background-color", "yellow");
    $("input").attr("disabled", "disabled");
  </script>
</body>
</html>

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jQuery input:not(:checked) + span — official demo (Try It)