How to automatically delete words from word list that only showed up once

To make wordclouds less cluttered, how can words mentioned only once (1x) from the word list be removed automatically or efficiently? Thanks

This cannot be done automatically. You need to edit the word list yourself en delete words with a frequency of 1.
This is very easy to do:

  1. Click Words → Edit word list
  2. Click on “Weight” to sort the words by weight. It will sort from least to most frequent words (click “Weight” again to sort the other way around)
  3. Click “Start multi-select” (first button in the blue menu bar)
  4. Click or drag words with a weight of 1
  5. Click the trash icon (4th icon in the blue menu bar).
  6. Click Apply

Voila!