Since iOS 8, the QuickType predictive text has been a tentpole feature of the iPhone’s keyboard. It analyzes the text you’ve typed so far and remembers new words that you type so it can suggest them later. However, if you tend to misspell a word, it automatically learns that word and offers it in the suggestions. If this happens a lot, it might even attempt to autocorrect the correctly spelled word to the misspelled “learned” word.
The iOS keyboard might also offer suggestions for embarrassing words it has learned. Having such words pop up in the suggestions can be really annoying. Let’s see how to remove certain words from the iOS keyboard dictionary.