Wasted-spend keywords (cost, no conversions)

function main() {
  // Read-only: keywords that spent over the threshold with zero conversions (last 30 days).
  var COST_THRESHOLD = 200; // in account currency — adjust to taste

  var keywords = AdsApp.keywords()
    .withCondition('Status = ENABLED')
    .withCondition('Cost > ' + COST_THRESHOLD)
    .withCondition('Conversions = 0')
    .forDateRange('LAST_30_DAYS')
    .orderBy('Cost DESC')
    .get();

  Logger.log('Keyword | Cost | Clicks  (spend with no conversions)');
  while (keywords.hasNext()) {
    var k = keywords.next();
    var s = k.getStatsFor('LAST_30_DAYS');
    Logger.log(k.getText() + ' | ' + s.getCost().toFixed(2) + ' | ' + s.getClicks());
  }
}