HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery not method alternative</title>
  <style>
    input { display: block; margin: 8px 0; padding: 6px; width: 240px; }
    .other-field { border: 2px solid #16a34a; background: #f0fdf4; }
  </style>
</head>
<body>
  <input type="text" name="newsletter" placeholder="newsletter">
  <input type="text" name="accept" placeholder="accept">
  <input type="text" placeholder="no name">
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("input").not("[name='newsletter']").addClass("other-field");
  </script>
</body>
</html>

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jQuery .not('[name=newsletter]') pattern (Try It)